Project won't start with latest stable on an AWS machine

vvvv gamma bug
1

good day,

I have a project running on an AWS machine that was working totally fine with 2021.4.6 previews, but fails to open every times with the stable.

The exception is always the same :

Argument 1: cannot convert from 'out T3' to 'out System.IObservable<T>
Full error 
VL.Lang.Platforms.Roslyn.EmitException: D:\xxx\Engine.vl.cs(2923,22): error CS1503: Argument 1: cannot convert from 'out T3' to 'out System.IObservable<T>'
   at VL.Lang.Platforms.Roslyn.TargetCompilation.<>c__DisplayClass45_0.<Emit>g__EmitRelease|1()
   at VL.Lang.Platforms.Roslyn.TargetCompilation.Emit(IProjectSymbol project, CSharpCompilation compilation, Boolean isDebug, Boolean includeSource, CancellationToken token)
   at VL.Lang.Platforms.Roslyn.TargetCompilation.<>c__DisplayClass2_0.<InitializeAsync>g__Build|2(ProjectBuildRequest projectBuildRequest)
   at VL.Lang.Platforms.Roslyn.TargetCompilation.<>c__DisplayClass2_0.<InitializeAsync>g__BuildOrLoad|1(ProjectBuildRequest buildRequest)
   at VL.Lang.Platforms.Roslyn.TargetCompilation.<>c__DisplayClass2_1.<<InitializeAsync>b__5>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at VL.Lang.Platforms.Roslyn.TargetCompilation.<InitializeAsync>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at VL.Lang.Platforms.Roslyn.TargetCompilation.<CreateAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at VL.Lang.Platforms.Roslyn.TargetCompilation.<WithCompilationAsync>d__41.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at VL.Lang.Platforms.Roslyn.TargetCompilation.<VL-Lang-Symbols-ITargetCompilation-WithCompilationAsync>d__42.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at VL.Model.VLSession.<CreateTargetCompilationAsync>d__168.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at VL.Model.VLSession.<UpdateRuntimesAsync>d__167.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at VL.Model.VLSession.<UpdateCompilationAsync>d__190.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at VL.Model.VLSession.<UpdateCompilationAsync>d__190.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at VL.Model.VLSession.<UpdateCompilationAsync>d__187.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at VL.Model.VLSession.<UpdateAsync>d__183.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at VL.Model.VLSession.<LoadDocuments>d__155.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at VL.UI.Forms.VLContext.<InitializeAsync>d__11.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at VL.UI.Forms.VLContext.<<OnOpen>b__10_0>d.MoveNext()

The same patch opens just fine with preview 834 on the VM.
On my local dev machine, it works just fine with the stable version.

Any hints?

Thanks!

seb

2

Not sure if it is really related but I think I experienced something similar. Working on the patch on one machine then moving to another I had exceptions at startup. I ended up deleting all (hidden) .vl folders and it started working again. Don’t know why and maybe it was just a coincidence. It was late and I didn’t have the leisure to investigate further. Unfortunately I didn’t save the exception log.

Have you tried starting vvvv first and then opening the patch (with vvvv stopped)?

3

Thanks for the suggestion @bjoern, that actually helped.

The project is started with a bat file, so I did not even had a chance to see the patch editor (the exception was thrown before it could open).

When opening the editor and then opening the VL file, it turns out it was just a missing nuget :-(

4

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