FileNotFoundException error happening when right-clicking TFS-managed App.config's

[stimpy77]

Users are reporting this frequently. So far I've been unable to reproduce.

FastKoala: Error: Unhandled FileNotFoundException (System.IO.FileNotFoundException):
   at Wijits.FastKoala.SourceControl.TfsExeWrapper.<ItemIsUnderSourceControl>d__0.MoveNext()
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.Start[TStateMachine](TStateMachine& stateMachine)
   at Wijits.FastKoala.SourceControl.TfsExeWrapper.ItemIsUnderSourceControl(String filename)
   at Wijits.FastKoala.SourceControl.VsFileSystemManipulatorFactory.<DetectSccSystem>d__6.MoveNext() in c:\projects\fastkoala\Fast Koala\SourceControl\VsFileSystemManipulatorFactory.cs:line 79
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Wijits.FastKoala.SourceControl.VsFileSystemManipulatorFactory.<GetFileSystemManipulatorForEnvironment>d__0.MoveNext() in c:\projects\fastkoala\Fast Koala\SourceControl\VsFileSystemManipulatorFactory.cs:line 27
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Wijits.FastKoala.FastKoalaPackage.<GetTransformationsEnabler>d__b.MoveNext() in c:\projects\fastkoala\Fast Koala\FastKoalaPackage.cs:line 340
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Wijits.FastKoala.FastKoalaPackage.<EnableBuildTimeTransformationsMenuItem_BeforeQueryStatus>d__3d.MoveNext() in c:\projects\fastkoala\Fast Koala\FastKoalaPackage.cs:line 629