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Could not complete testing: fitnesse.slim.SlimError: Error SLiM server died before Header Message could be read

I am trying to integrate Fitness with Visual Studio 2022. Have .NET 6.0 installed. Following the instructions given in this link. However, every time I run the Test it throws the error
Could not complete testing: fitnesse.slim.SlimError: Error SLiM server died before Header Message could be read. Unable to start test system 'slim': fitnesse.slim.SlimError: Error SLiM server died before Header Message could be read.
Looks like I am missing something very basic about Slim. Please let me know the resolution for this.

I was able to resolve this. The Target Framework RunnerW was pointing to was incorrect. It was pointing to Dotnet4.8. I modified this. But, and included into the fitsharp solution. Then, building solution from Visual Studio kept failing. Identified that this needed updating the Nuget package. Updating kept skipping every time stating the package was already installed. Was unable to build because of these reasons. Was finally able to have breakthrough when I built the solution from cli. Running the Test after this was successful.

R.NET works with x86 but not x64

I'm trying to build and run the Hello World sample at the tutorial page at R.NET. When I force the program to run in x86 mode, it seems to do OK. However, when I run in x64, it stops very early on with the message, "[program] exited with code-1073740791"
I've installed the latest version of R at The R Project and have ran the troubleshooting steps. The output I've gotten from the troubleshooting program is:
Is this process 64 bits? True
Info: caller provided rPath=null, rHome=null Info: R.NET looked for preset R_HOME env. var. Found null
Info: Found Windows registry key RDotNet.NativeLibrary.WindowsRegistryKey
Info: Found Windows registry key RDotNet.NativeLibrary.WindowsRegistryKey
Info: Found sub-key InstallPath under RDotNet.NativeLibrary.WindowsRegistryKey
Info: InstallPath value of key RDotNet.NativeLibrary.WindowsRegistryKey: C:\Program Files\R\R-4.0.3
Info: R.NET looked for platform-specific way (e.g. win registry). Found C:\Program Files\R\R-4.0.3
Info: R.NET trying to find rPath based on rHome; Deduced C:\Program Files\R\R-4.0.3\bin\x64
C:...\bin\x64\Debug\net5.0\ConsoleNet5R.exe
(process 33500) exited with code -1073740791.
I have verified that there IS a file R.dll where it deduced it should be, "C:\Program Files\R\R-4.0.3\bin\x64". When I step through using my decompiler, it appears that it gets choked up at what is showing up for me as line 400 in REngine.cs, under the function "Initialize" at this.GetFunction<setup_Rmainloop>()(); It doesn't appear to throw an exception, it just stops. I'll be honest--I'm not sure what this line is supposed to be doing...
Any ideas what is going on? I can run in x86 mode if I have to, but I would like to use x64 if possible.

This issue has been reported for a while..
I experienced the same with R-4.0.3 to R-4.0.5.
There is not such issue for R-4.0.2 and former versions (4.0.1, 4.0.0, 3.6, 3.5)

I've done an analysis of this and tracked findings in one of the RDotNet GitHub issues where this was raised (https://github.com/rdotnet/rdotnet/issues/139#issuecomment-898699993).
This appears to be related to the Control Flow Guard security feature enabled in Windows 10. This doesn't happen in the R programs themselves because they are compiled using a different compiler (gcc via mingw) than Microsoft's. However, the CFG feature is enabled for .NET binaries and there is something (sorry, I don't know the actual underlying root cause) in a change within R 4.0.3 in setjmp/longjmp calls that is causing the crash (see: https://github.com/wch/r-source/blob/trunk/src/gnuwin32/fixed/h/psignal.h#L44-L51).
Although you would actually be disabling a security feature, I have had some luck for now in modifying my program after it is compiled (you can set this as a post-build event). You will need to run something like: link /EDIT /GUARD:NO <yourapp>.exe, which disables CFG.
Thanks to https://github.com/dotnet/runtime/issues/11899#issuecomment-502195325 for providing the instructions needed for this workaround, and https://www.trendmicro.com/en_us/research/16/j/control-flow-guard-improvements-windows-10-anniversary-update.html for providing the amazing analysis of CFG that led to an understanding of what was going on.

Unable to run Console Application from Visual Studio: System.AccessViolationException

Description
When launching any Console Application, the code stops running immediately on an AccessViolationException (Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt). More info included in the next section.
Technical Symptoms
The Call Stack only contains external code:
Exception:Thrown: "The message filter indicated that the application is busy. >(Exception from HRESULT: 0x8001010A (RPC_E_SERVERCALL_RETRYLATER))" (System.Runtime.InteropServices.COMException)
A System.Runtime.InteropServices.COMException was thrown: "The message filter indicated that the application is busy. (Exception from HRESULT: 0x8001010A (RPC_E_SERVERCALL_RETRYLATER))"
Time: 12/10/2015 10:59:55 AM
Thread:vshost.NotifyLoad[15344]
I created a new Console Application, containing only Console.WriteLine("Hello world!");
Running the new Hello world app results in the same exception and an identical
call stack.
Background
I suspect this has nothing to do with the issue, as I will explain, but I feel it is important to answer the obvious question, "what were you doing when the issue happend?" The last change I made was adding an extension to my Selenium Driver to hotkey logout from an application:
public static void logout(this IWebDriver Driver)
{
Driver.FindElement(By.TagName("body")).Click();
new Actions(Driver)
.SendKeys(Keys.Control + Keys.Shift + "x")
.Perform();
}
I also made a change in my App.Config file for one of my projects, but reverting this had no impact either.
Removing this code (the Driver extension and/or the App.Config change) does not resolve this issue. Retrieving a previous check-in does not resolve the issue. I am the only person currently working on this solution.
Discoveries
As mentioned, this is happening for an empty Console Application. Windows Form Applications launch fine. Unit Test Projects launch fine as well.
Research
I've spent hours looking into this. It seems like every similar issue I have looked into is pertinent to debugging only or a .NET version. For me, the issue occurs with a Release as well. Additionally, I have been using .NET 4.5 without any issues or changes on that front. I can't find any articles that seem worth posting, but I might be overlooking something.
Visual Studio Info
Microsoft Visual Studio Ultimate 2013
Version 12.0.30501.00 Update 2
.NET Version 4.6.00081 (just noticed it says 4.5 in my project properties, though)
Running as Administrator
Feedback
When Running from devenv.exe /SafeMode, Visual Studio loaded with:
An exception was encountered while constructing the content of this frame. This information is also logged in "C:\Users\UserName\AppData\Roaming\Microsoft\VisualStudio\12.0\ActivityLog.xml".
Exception details:
System.UnauthorizedAccessException: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))
at Microsoft.VisualStudio.Shell.Interop.IVsShell5.LoadPackageWithContext(Guid& packageGuid, Int32 reason, Guid& context)
at Microsoft.VisualStudio.Platform.WindowManagement.WindowFrame.GetPackage()
at Microsoft.VisualStudio.Platform.WindowManagement.WindowFrame.ConstructContent()
Additionally, when trying to run, I get an error message of "Error while trying to run project: Invalid Pointer" (again, VS in devenv.exe /SafeMode - see how to run visual studio without plugin and all third party feature if unfamiliar)
Please let me know if I can provide any additional information.

It may be because when you name the project you can't put spaces, I put them and it gave me a AccessViolationException aswell, try using capitals to separate your words, but only use letters and no spaces to be sure.

I also faced this issue with Visual Studio 2010. More interestingly I had several projects in my solution (Console application, WPF application, Windows Forms application) but it was failing only when, I was setting the project which was of type "Console Application" as start up project. Following change finally helped me nail down the issue: Go to project properties of the console application project -> Go to "Debug" tab -> Go to "Enable Debuggers" section in right pane -> Check the "Enable unmanaged code debugging" check box as shown in the snapshot below. Root cause of why it happened is still not known to me. Only thing which I observed as fishy was that there were lot of windows updates which had got installed on my machine the previous night which mostly constituted of office updates and OS updates (More than a dozen KB articles).

Windows store app fails AppContainerCheck

I'm getting the below error when I try to run the app certification test on my windows 8.1 app. I've looked around for a while and can't seem to find any solutions for this. The app is written in C#/xaml which I wasn't aware even had a linker.
I'm hoping that someone can guide me in the right direction on how I should start to investigate an error like this as web searches have thus far failed me
Binary analyzer
•Error Found: The binary analyzer test detected the following errors:
◦File [MyTabletApplication.exe] has failed the AppContainerCheck check.
•Impact if not fixed: If the app doesn’t use the available Windows protections, it can increase the vulnerability of the customer's computer to malware.
•How to fix: Apply the required linker options - SAFESEH, DYNAMICBASE, NXCOMPAT, and APPCONTAINER - when you link the app. See links below for more information:

If you are using Visual Studio 2015 and this is a new solution/project make sure the 'Compile with .NET Native tool chain' check box is cleared in the startup project properties in the Release configuration.

MonoTouch - running mdtool from Jenkins

I downloaded the latest MonoTouch (4.0.4.1 and MonoDevelop 2.6 beta) to fix some issues we were having.
I was hoping that my build in Jenkins (using mdtool) would start working, but no luck.
mdtool gives this error (shortened):
2011-07-28 08:18:47.399 mdtool[14484:60f] *** __NSAutoreleaseNoPool(): Object 0x492260 of class NSCFString autoreleased with no pool in place - just leaking
2011-07-28 08:18:47.401 mdtool[14484:60f] +[NSDictionary dictionaryWithContentsOfFile:]: unrecognized selector sent to class 0xa0bdd3ec
2011-07-28 08:18:47.401 mdtool[14484:60f] *** __NSAutoreleaseNoPool(): Object 0x3f02540 of class NSCFString autoreleased with no pool in place - just leaking
In the past this was related to code generation with the designer.
Is this a known issue being working on by Xamarin? (I can open a bugzilla bug if needed)
PS: one thing else to mention, is we have deleted the designer.cs files for several of our views. (This was a crude way to disable code generation at the time, we needed to manually setup our outlets, exports, etc.)
EDIT: posted to bugzilla here.

You are not using the stable version of MonoDevelop, you are using an outdated preview, that was fixed in later betas.