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InitializeComponent() Cannot locate resource based on system language

The application was developed on machines running windows 10, with the system language set to our local language, danish. Now we are at a stage where the software needs to be used in offices in other countries.
However, the view crashes on startup on those machines, and I have found out that if I change the system language on my own machine, it will not work for me either.
Why this is, we can't figure out.
Error message from InitializeComponent:
System.IO.IOException: 'Cannot locate resource 'views/main/mainview.xaml'.'
StackTrace:
at MS.Internal.AppModel.ResourcePart.GetStreamCore(FileMode mode,
FileAccess access) at
System.IO.Packaging.PackagePart.GetStream(FileMode mode, FileAccess
access) at System.IO.Packaging.PackagePart.GetStream() at
System.Windows.Application.LoadComponent(Object component, Uri
resourceLocator) at
InfoCenter.Views.Main.MainView.InitializeComponent() in
D:\Workspace\Visual Studio\MT Info Center WPF\Info
Center\Views\Main\MainView.xaml:line 1 at
InfoCenter.Views.Main.MainView..ctor() in D:\Workspace\Visual
Studio\MT Info Center WPF\Info Center\Views\Main\MainView.xaml.cs:line
21 at InfoCenter.App.OnStartup(StartupEventArgs e) in
D:\Workspace\Visual Studio\MT Info Center WPF\Info
Center\App.xaml.cs:line 57 at
System.Windows.Application.<.ctor>b__1_0(Object unused) at
System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate
callback, Object args, Int32 numArgs) at
System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source,
Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl() at
System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object
state) at
System.Threading.ExecutionContext.RunInternal(ExecutionContext
executionContext, ContextCallback callback, Object state, Boolean
preserveSyncCtx) at
System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state, Boolean
preserveSyncCtx) at
System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state) at
MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext
executionContext, ContextCallback callback, Object state) at
System.Windows.Threading.DispatcherOperation.Invoke() at
System.Windows.Threading.Dispatcher.ProcessQueue() at
System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32
msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at
MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam,
IntPtr lParam, Boolean& handled) at
MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at
System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate
callback, Object args, Int32 numArgs) at
System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source,
Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at
System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority
priority, TimeSpan timeout, Delegate method, Object args, Int32
numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd,
Int32 msg, IntPtr wParam, IntPtr lParam) at
MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) at
System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame
frame) at
System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Application.RunDispatcher(Object ignore) at
System.Windows.Application.RunInternal(Window window) at
System.Windows.Application.Run(Window window) at
System.Windows.Application.Run() at InfoCenter.App.Main() in
D:\Workspace\Visual Studio\MT Info Center WPF\Info
Center\obj\Debug\App.g.cs:line 51
Here is some of the code:
App.xaml
<!--ANCHOR: Updater-->
<updater:SingleInstanceApplication x:Class="InfoCenter.App"
x:Name="App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:updater="clr-namespace:InfoCenter.Updater">
<Application.Resources>
</Application.Resources>
</updater:SingleInstanceApplication>
App.xaml.cs:
protected override void OnStartup(StartupEventArgs e)
{
if (PreProcessor.Prod)
Dispatcher.UnhandledException += OnDispatcherUnhandledException;
base.OnStartup(e);
AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
var app = new MainView { ShowInTaskbar = false, Topmost = true }
var context = new MainViewModel();
app.DataContext = context;
app.Show();
}
Other info:
- We deploy using ClickOnce.
- The app have some background tasks that will keep running. It look like it just runs without a view.
- We use MVVM pattern.
If I am missing some information, don't hesitate to ask!

It was a problem regarding the Culture Info, since you have added this line in your resource file
<UICulture>en-US</UICulture>
Following this post you should be able to solve your problem uncommenting this line
[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
in your assembly.info.cs

Observablecollection Index was outside the bounds of the array

I am sporadically getting this error in my application.
As it seems by stack it occurs in CollectionView outside of my code and crashes the process.
I wondered if anyone experienced this and can guide me to the cause of exception.
at System.Collections.ObjectModel.Collection`1.System.Collections.ICollection.CopyTo(Array array, Int32 index)
at System.Collections.ArrayList.InsertRange(Int32 index, ICollection c)
at System.Windows.Data.ListCollectionView.<RefreshOverride>b__1_0()
at MS.Internal.Data.SynchronizationInfo.AccessCollection(IEnumerable collection, Action accessMethod, Boolean writeAccess)
at System.Windows.Data.BindingOperations.AccessCollection(IEnumerable collection, Action accessMethod, Boolean writeAccess)
at System.Windows.Data.ListCollectionView.RefreshOverride()
at System.Windows.Data.CollectionView.RefreshInternal()
at System.Windows.Data.CollectionView.ProcessChangeLog(ArrayList changeLog, Boolean processAll)
at System.Windows.Data.CollectionView.ProcessInvoke(Object arg)
at MS.Internal.Data.DataBindEngine.ProcessCrossThreadRequests()
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Window.ShowHelper(Object booleanBox)
at System.Windows.Window.ShowDialog()
at Manager.Views.ShellView.SharedLib.Views.IClosableView.ShowDialog()
at Manager.Modules.MainModule.Start() in D:\My Documents\Visual Studio 2015\Projects\Gizmo\Manager\Manager\Modules\NonPluggable\MainModule.cs:line 253
at Manager.App.OnStartup(StartupEventArgs e) in D:\My Documents\Visual Studio 2015\Projects\Gizmo\Manager\Manager\App.xaml.cs:line 134
at System.Windows.Application.<.ctor>b__1_0(Object unused)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at Manager.App.Main()

How to Close a Window in the OnWindowRendred event handler?

OnContentRendred will initiate License checking, if there's no valid license I'll provide a LicenseWindow to select one. If the user closes the LicenseWindow without selecting a valid license, the MainWindow will be closed too.
This is the Handler of the OnContentRendred- Event of MainWindow:
private void CheckLicenseOnContentRendered(object sender, EventArgs e)
{
ContentRendered -= CheckLicenseOnContentRendered;
try
{
Initialize(); // may throw LicenseException
}
catch (LicenseException)
{
var licenseWindow = new LicenseWindow();
if (licenseWindow.ShowDialog() == true)
{
// Do Stuff if valid License selected
}
else
{
this.Close(); // <-- NullReferenceException
}
}
catch (Exception ex)
{
// Other Exceptions will be handled here
}
}
As tagged in the codesample the this.Close() results in a NullReferenceException.
I did some debugging and with the ImmediateWindow I managed to find out that this is not null (as it should be)
So then why could this.Close() cause a NullReferenceException and maybe how do I Close the Window in an other way?
EDIT:
Stack Trace:
bei Giag.DataReader.ControlLibrary.Windows.MainWindow.WindowClosing(Object sender, EventArgs e) in d:\...\Windows\MainWindow.xaml.cs:Zeile 210.
bei System.Windows.Window.OnClosing(CancelEventArgs e)
bei System.Windows.Window.WmClose()
bei System.Windows.Window.WindowFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei System.Windows.Interop.HwndSource.PublicHooksFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
bei System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
bei MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
bei System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
bei MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
bei MS.Win32.UnsafeNativeMethods.UnsafeSendMessage(IntPtr hWnd, WindowMessage msg, IntPtr wParam, IntPtr lParam)
bei System.Windows.Window.InternalClose(Boolean shutdown, Boolean ignoreCancel)
bei System.Windows.Window.Close()
bei Giag.DataReader.ControlLibrary.Windows.MainWindow.CheckLicenseOnContentRendered(Object sender, EventArgs e) in d:\...\Windows\MainWindow.xaml.cs:Zeile 236.
bei System.Windows.Window.OnContentRendered(EventArgs e)
bei System.Windows.Window.<PostContentRendered>b__4(Object unused)
bei System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
bei MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
bei System.Windows.Threading.DispatcherOperation.InvokeImpl()
bei System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
bei System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
bei System.Windows.Threading.DispatcherOperation.Invoke()
bei System.Windows.Threading.Dispatcher.ProcessQueue()
bei System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
bei System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
bei MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
bei System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
bei MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
bei MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
bei System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
bei System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
bei System.Windows.Threading.Dispatcher.Run()
bei System.Windows.Application.RunDispatcher(Object ignore)
bei System.Windows.Application.RunInternal(Window window)
bei System.Windows.Application.Run(Window window)
bei System.Windows.Application.Run()
bei FrameworkTestClient.App.Main() in d:\...\FrameworkTestClient\obj\Debug\App.g.cs:Zeile 0.
bei System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
bei System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
bei Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
bei System.Threading.ThreadHelper.ThreadStart_Context(Object state)
bei System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
bei System.Threading.ThreadHelper.ThreadStart()
EDIT 2:
In a test Project the code above works fine.. So I will need to find the Fault somewhere else. Thanks for your help, i'll keep you in touch.

Not sure if I understood your question correctly, but if you want to exit the whole program if no license is found, you can use Application.Current.Shutdown(); to close the main window and exit application.

There was an Error in the Closing Event handler.
One will learn debugging correctly sometime...
Thanks to all to you.

NullReferenceException after calling ShowDialog() in System.Windows.Interop.HwndSource.OnPreprocessMessage

I have a WPF application and sometimes app crashes just after I call ShowDialog() on Window (http://msdn.microsoft.com/en-us/library/system.windows.window.showdialog%28v=vs.110%29.aspx)
When application starts I open a main dialog (it's always opened) then I want to open a new child dialog (see below ShowModal method), and usually everything works fine but sometimes after calling ShowDialog() (see below code snippet) it throws System.NullReferenceException in PresentationFramework.dll in method System.Windows.Interop.HwndSource.OnPreprocessMessage(Object param).
After calling ShowDialog() the window is shown in App, then when I click anywhere on it (for example a textbox), it throws NullReferenceException .
I'm unable to reproduce crashing pattern it behaves completely randomized. And I'm starting to go crazy because I don't have any clue how to trace where is the problem.
This is the snippet from my code:
private Window Wnd { get; set; }
public bool ShowModal(ViewModel vm)
{
if( Wnd == null )
{
throw new InvalidOperationException( "Window was already closed" );
}
Wnd.DataContext = vm;
Result = Wnd.ShowDialog().Equals(true);
return Result;
}
Wnd is not null it contains instance of window I want to show. Exception is thrown in this line
Result = Wnd.ShowDialog().Equals(true);
actually after Wnd.ShowDialog()
Thrown exception snapshot:
System.NullReferenceException {"Object reference not set to an instance of an object."}
HResult = -2147467261
Message = Object reference not set to an instance of an object.
Data = {System.Collections.ListDictionaryInternal}
InnerExcpetion = null
Source = PresentationCore
StackTrace
at System.Windows.Interop.HwndSource.OnPreprocessMessage(Object param)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
at System.Windows.Interop.HwndSource.OnPreprocessMessageThunk(MSG& msg, Boolean& handled)
at System.Windows.Interop.HwndSource.WeakEventPreprocessMessage.OnPreprocessMessage(MSG& msg, Boolean& handled)
at System.Windows.Interop.ThreadMessageEventHandler.Invoke(MSG& msg, Boolean& handled)
at System.Windows.Interop.ComponentDispatcherThread.RaiseThreadMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Window.ShowHelper(Object booleanBox)
at System.Windows.Window.Show()
at System.Windows.Window.ShowDialog()
at Intes.Utility.VisualizerService.UiWindow.ShowModal(ViewModel vm) in d:\Coder\Branch-AT\Source\Utilities\VisualizerService\Window abstraction\Implementation\UiWindow.cs:line 109
// this part of call stack is not important, but I will leave it
at A13.ViewModels.CalGroupExplorer.CalGroupExplorerPanelViewModel.NewMessage(IEnumerable`1 referenceIDs) in d:\Coder\Branch-AT\Source\A13\A13\ViewModels\CalGroupExplorer\CalGroupExplorerPanelViewModel.cs:line 159
at A13.ViewModels.EntryViewModel.AddReferencedMessage() in d:\Coder\Branch-AT\Source\A13\A13\ViewModels\CalGroupExplorer\EntryViewModel.cs:line 147
at A13.ViewModels.EntryViewModel.<get_AddReferencedMessageCommand>b__4(Object param) in d:\Coder\Branch-AT\Source\A13\A13\ViewModels\CalGroupExplorer\EntryViewModel.cs:line 136
at Intes.Utility.Wpf.RelayCommand.Execute(Object parameter) in d:\Coder\Branch-AT\Source\Utilities\Wpf\RelayCommand.cs:line 70
at MS.Internal.Commands.CommandHelpers.CriticalExecuteCommandSource(ICommandSource commandSource, Boolean userInitiated)
at System.Windows.Controls.MenuItem.InvokeClickAfterRender(Object arg)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Window.ShowHelper(Object booleanBox)
at System.Windows.Window.Show()
at System.Windows.Window.ShowDialog()
It seems like bug in .NET Framework, I'm using .NET Framework 4.5 for both projects A13 and Intes. A13 is main project , while Intes is referenced (method ShowModal is in class that is in project Intes). A13 is compiled as platform target: x86, while Intes as platform target: AnyCPU.
I'm running application in DEBUG mode on Windows 8.1 on x64 processor (Application has to be a x86).
Does anybody have any idea where could be the problem or any help how to trace the problem?

C# NullReferenceException, but I don't know what's causing it

I get a NullRefrenceException once in a while (it happens maybe one out of ten times) when I drop an object on a RadChart (from the Telerik-components).
Now I'd like to know which object is causing the Exception, but I don't really understand which one it is from just looking at the StackTrace.
That's the stack-trace:
bei System.Windows.Controls.VirtualizingStackPanel.BringIndexIntoView(Int32 index)
bei System.Windows.Controls.ItemsControl.OnBringItemIntoView(Object arg)
bei System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
bei MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
bei System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
bei System.Windows.Threading.DispatcherOperation.InvokeImpl()
bei System.Threading.ExecutionContext.runTryCode(Object userData)
bei System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
bei System.Windows.Threading.DispatcherOperation.Invoke()
bei System.Windows.Threading.Dispatcher.ProcessQueue()
bei System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
bei System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
bei MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
bei System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
bei System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
bei MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
bei MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
bei System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
bei System.Windows.Application.RunInternal(Window window)
bei System.Windows.Application.Run()
bei Filiale_der_Zukunft.App.Main() in D:\oberflaeche-der-zukunft\TP_IT\Prototyp\Filiale der Zukunft\obj\Debug\App.g.cs:Zeile 0.
bei System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
bei Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
bei System.Threading.ThreadHelper.ThreadStart()

Nothing in your StackTrace shows the Telerik RadControl.
Looking att the top of the stacktrace it seems that you try to show an element that is not yet created.