system.invalidoperationexception sequence contains no ele.

Question

EXCEPTION: SystemInvalidOperationException: Sequence contains no elements at System.Linq.Enumerable.First[TSource](IEnumerable1 source) at Mono.Debugging.VisualStudio.SymbolsAdapter.CheckForSymbols(Strin g path) in E:\A_work\2914 \s\src\Debugging.VisualStudio.Vsix\Integration\Symb olsAdapter.cs:line 105 at Mono.Debugging.VisualStudio.SymbolsAdapter.RefreshSymbolPath(Str ing assemblyPath) in E:\A_work\2914 \s\src\Debugging.VisualStudio.Vsix\Integration\Symb olsAdapter.cs:line 74 at Mono.Debugging.VisualStudio.SymbolsAdapter.OnAssemblyLoaded(0 bject sender, AssemblyEventArgs e) in EAA_work\2914\s\src\Debugging.VisualStudio.Vsix\Integration\Symb olsAdapter.cs:line 62 at Mono.Debugging.Client.DebuggerSession.OnAssemblyLoaded(String assemblyLocation) in E: &work\ 2914 s \ external \ debugger-libsWono.Debugging ono. De bugging.Client\DebuggerSession.cs:line 1261 at Mono.Debugging.Soft.SoftDebuggerSession.HandleAssemblyLoadEven ts(AssemblyLoadEventD events) in EAA_work\2914 \s\external\debugger-libsWono.Debugging.Soft \Soft DebuggerSession.cs:line 2071 at