I got this error in VS 2022 (latest 17.12 Preview 2.1).
Blazor: Feature 'Razor TagHelperProvider Feature' is currently unavailable due to an internal error
If you watch the stack trace it says
StreamJsonRpc.RemoteInvocationException: Sequence contains no elements at StreamJsonRpc.JsonRpc.<InvokeCoreAsync>d__155`1.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 System.Threading.Tasks.ValueTask`1.get_Result() at Microsoft.CodeAnalysis.Remote.BrokeredServiceConnection`1.<TryInvokeAsync>d__18`1.MoveNext()RPC server exception:System.InvalidOperationException: Sequence contains no elements...The error occurs also in elder versions of VS. It came somehow out of a sudden, but in the cycle of updates, pulling code from others and own work it was hard to tell when exactly.