system.invalidoperationexception sequence contains no ele.

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

2 Replies

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Jignesh Kumar6y ago
Hi Sujeet,

Please check this link it will help you,
https://stackoverflow.com/questions/21008017/why-is-this-error-sequence-contains-no-elements-happening/21008130
Ravi Patel6y ago
Hi,

change your query
If you are using Single in LINQ, change your habit to use SingleOrDefault.
If you are using First or Last in LINQ, use FirstOrDefault or LastOrDefault.
If you are using ElementAt, use ElementAtOrDefault.