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Build.cs not working even after being restores to it's previous version

I'm trying to compile a project I'm working on and this error mesages pops out:
Invalidating makefile for SpaceShooterEditor (SpaceShooter.Build.cs modified)
While compiling E:\ue projects\SpaceShooter\Intermediate\Build\BuildRules\SpaceShooterModuleRules.dll:
e:\ue projects\SpaceShooter\Source\SpaceShooter\SpaceShooter.Build.cs(3,29) : error CS0246: The type or namespace name 'ModuleRules' could not be found (are you missing a using directive or an assembly reference?)
e:\ue projects\SpaceShooter\Source\SpaceShooter\SpaceShooter.Build.cs(5,25) : error CS0246: The type or namespace name 'ReadOnlyTargetRules' could not be found (are you missing a using directive or an assembly reference?)
ERROR: Unable to compile source files.
Any idea why this might happen? Last night i was trying to code a widget, modified the build.cs, then replaced the modified version (which chrashed the game) with a build.cs that worked previously, and still nothing? Is there any hope to make it work or should i start over? Moreover, how can this be avoided?
I already did the restarts and refreshes. I went to even delete the binaries and some cashed files and it didn't work.
Below you'll find the content of the Build.cs:
public class SpaceShooter : ModuleRules
{
public SpaceShooter(ReadOnlyTargetRules Target) : base(Target)
{
PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore" });
PrivateDependencyModuleNames.AddRange(new string[] { });
// Uncomment if you are using Slate UI
// PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore" });
// Uncomment if you are using online features
// PrivateDependencyModuleNames.Add("OnlineSubsystem");
// To include OnlineSubsystemSteam, add it to the plugins section in your uproject file with the Enabled attribute set to true
}
}
When i try to input specify the using UnrealBuildTool;, Visual Studio, for some reason, deletes it when i hit compile or save.

After some digging, i found out that wrapping the content in a namespace UnrealBuidTool.Rules{} solves this. In the end, the build file looks like this:
namespace UnrealBuildTool.Rules
{
public class SpaceShooter : ModuleRules
{
public SpaceShooter(ReadOnlyTargetRules Target) : base(Target)
{
PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore" });
PrivateDependencyModuleNames.AddRange(new string[] { });
// Uncomment if you are using Slate UI
// PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore" });
// Uncomment if you are using online features
// PrivateDependencyModuleNames.Add("OnlineSubsystem");
// To include OnlineSubsystemSteam, add it to the plugins section in your uproject file with the Enabled attribute set to true
}
}
}

As you do not share what is included in your Build.cs file I will just explain what the error is and how you could fix it. The error basically says that it couldn't compile the Build.cs file based on the lines 29 and 25, and that the types that are used there called 'ModuleRules' and 'ReadOnlyTargetRules' could not be found in any of the namespaces that were included by the using statements at the top of Build.cs. These types are both stored in the UnrealBuildTool namespace and can thus be included in your file by typing:
using UnrealBuildTool;
This however seems like a trivial solution to your problem, but as you do not share a lot of info this is the best solution I can give you for now.

Xamarin assembly conflicts with the imported type

So I was changing my Project name and also my folders etc. I followed guide from here How do I rename a Project Folder from within Visual Studio?. All seemed to work, I can launch my app, but I got some erros and lots of lots of warnings
Warning example:
Warning CS0436 The type 'ObservableObject' in 'C:\Users\Godhaze\Documents\Volaapp\Volaapp\Volaapp\Base\ObservableObject.cs' conflicts with the imported type 'ObservableObject' in 'TodoScheduler, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'. Using the type defined in 'C:\Users\Godhaze\Documents\Volaapp\Volaapp\Volaapp\Base\ObservableObject.cs'. Volaapp C:\Users\Godhaze\Documents\Volaapp\Volaapp\Volaapp\Base\SelectableObject.cs 5 IntelliSense Active
And errors like this:
Error CS0234 The type or namespace name 'XamlFilePathAttribute' does not exist in the namespace 'Xamarin.Forms.Xaml' (are you missing an assembly reference?) Volaapp C:\Users\Godhaze\Documents\Volaapp\Volaapp\Volaapp\obj\Debug\TodoScheduler.Pages.MenuPage.xaml.g.cs 14 IntelliSense Active
The code of the error:
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated by a tool.
// Runtime Version:4.0.30319.42000
//
// Changes to this file may cause incorrect behavior and will be lost if
// the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
namespace TodoScheduler.Pages {
[global::Xamarin.Forms.Xaml.XamlFilePathAttribute("C:\\Users\\Godhaze\\Documents\\Visual Studio 2017\\Projects\\Volaapp\\Volaapp\\Volaapp\\Pa" +
"ges\\MenuPage.xaml")]
public partial class MenuPage : global::TodoScheduler.Controls.BasePage {
[global::System.CodeDom.Compiler.GeneratedCodeAttribute("Xamarin.Forms.Build.Tasks.XamlG", "0.0.0.0")]
private global::Xamarin.Forms.ListView listView;
[global::System.CodeDom.Compiler.GeneratedCodeAttribute("Xamarin.Forms.Build.Tasks.XamlG", "0.0.0.0")]
private void InitializeComponent() {
global::Xamarin.Forms.Xaml.Extensions.LoadFromXaml(this, typeof(MenuPage));
listView = global::Xamarin.Forms.NameScopeExtensions.FindByName<global::Xamarin.Forms.ListView>(this, "listView");
}
}
}
So I think Its an problem with Assembly?
I Added Reference In the first place, so what could be the problem?
Also do I need to change my namespaces? My projects name of PCL is "Volaapp" But Im using namespaces like: TodoScheduler.Base, because I think its refers to the Assembly. I might misunderstood this!
I tried cleaning the solution then deleting bin,obj folders and then rebuilding it, but that dident help.
So what should I do? I really want to fix this case and I can even give the full code of this to fix :(

I had the same problem, and found out I was performing a font size change operation on an array of labels that contained an image by accident.

Object in ProjectReference not accessible when using 'Import'

In a simple project i want to reference objects from a webreference added to another c# library.
The Webreference is called QServices The default namespace is set as below
What seems to work is the following code:
Taskworkflow.SI.QServices.Record[] querysResult = new Taskworkflow.SI.QServices.Record[0];
yet when i import the Taskworkflow.SI - namespace, i keep on getting errors:
using TaskWorkflow.SI;
....
QServices.Record[] querysResult = new QServices.Record[0];
This results in the error:
The type or namespace name 'QServices' could not be found (are you missing a using directive or an assembly reference?)
Could someone clarify this for me?
Thank you for your time.
Note: QServices do only exist inside TaskWorkflow.SI. They do not have any occurences in other projects nor do they have any classes/namespaces/objects that share the name.

I strongly suspect that for whatever reason, you're ending up with a namespace called QServices declared in the TaskWorkflow.SI namespace. So actually you want:
using TaskWorkflow.SI.QServices;
....
Record[] querysResult = new Record[0];
Or you could explicitly alias it:
using QServices = TaskWorkflow.SI.QServices;
....
QServices.Record[] querysResult = new QServices.Record[0];

Type or Namespace Error

I have two references in my application. In the BAL code i am able to use the namespace "using TestDAL;"
But I am not being able to use the namespace of BAL in my .cs page. This is the error i get,
CS0246: The type or namespace name 'TestBAL' could not be found (are
you missing a using directive or an assembly reference?)
And one thing in my bin folder too I only have the TestDAL.dll file. How do I insert TestBAL.dll file?
Can anyone help me with what can be possible reason?
Thanks in Advance,

Try this:
Then, click browse and add your .dll file:
That should help you, if not please leave some feedback.
You could also try using alias for your namespace like this:
using namespaceAlias = TestBAL;

Create object of TestBAL objBAL = new TestBAL(); in your cs page. Check out, This codes gives any error or not.

Embedding boo in C#, does not recognise executing assembly

scripts/ai/Dream.boo
import CultLib
import LonelyHero
class Dream(Enemy):
pass
C#
var bc = new BooCompiler();
bc.Parameters.Input.Add(new FileInput("rsc/script/ai/" + "Dream" + ".boo"));
bc.Parameters.Pipeline = new CompileToMemory();
bc.Parameters.References.Add(Assembly.GetExecutingAssembly());
bc.Parameters.References.Add(Assembly.LoadFile(new DirectoryInfo("CultLib.dll").FullName));
bc.Parameters.References.Add(Assembly.LoadFile(new DirectoryInfo("sfmlnet-audio-2.dll").FullName));
bc.Parameters.References.Add(Assembly.LoadFile(new DirectoryInfo("sfmlnet-graphics-2.dll").FullName));
bc.Parameters.References.Add(Assembly.LoadFile(new DirectoryInfo("sfmlnet-window-2.dll").FullName));
var cc = bc.Run();
if(cc.GeneratedAssembly!=null)
{
cc.GeneratedAssembly.CreateInstance("Dream", true, BindingFlags.NonPublic, null,
new object[] {Parent, pos}, null, null);
}
else
{
foreach (var error in cc.Errors)
Console.WriteLine(error);
}
In the line bc.Parameters.References.Add(Assembly.GetExecutingAssembly()); I add the executing assembly, which contains the namespace "LonelyHero". However, the error
rsc/script/ai/Dream.boo(2, 8): BCE0021: Namespace LonelyHero not found. maybe you forgot to add an assembly reference?
appears.
LonelyHero should exist, why does this error occur and what can I do to resolve it?
Note:
Upon replacing Assembly.GetExecutingAssmebly() with Assembly.GetAssembly(typeof(Enemy)) , thus assuring it adds the assembly with a class under the LonelyHero namespace, the same error occurs. Also with Assembly.LoadFile(new DirectoryInfo("LonelyHero.exe").FullName)
Occurs in Boo 0.9.4.9 and booxw-1203

Imported namespaces in BOO need to contain at least one public type for the import to succeed; otherwise you will get the BCE0021 error, so you want to make sure the Enemy type is public (or another one).

I don't know Boo or C# but I found someone asking a similar question on the Boo Programming Google Group. The question they were asking:
"Namespace 'Pathfinding' not found, maybe you forgot to add an assembly reference?"
Specifically they were getting this error:
I am converting some existing code I had from C# into Boo. One of my
classes had a "using Pathfinding" which got converted to "import
Pathfinding" by the script converter.
I get this error when trying to compile:
Assets/Script/VehicleController.boo(4,8): BCE0021: Namespace
'Pathfinding' not found, maybe you forgot to add an assembly
reference?
The Pathfinding library I'm using is written in C#. Could this cause
problems? Is there anything additional I need to do to make this work?
This looked like your error message and the solution someone mentioned was that you needed to put your scripts into your compilation phase earlier to ensure that they're accessible from scripts written in other languages.
This URL was cited as a reference/source for more information on script compilation.