Visual Studio throws the same error message for all indicators I try to import

In two indicators written by Bard, it appears only once. In several imported from the ecosystem website, it appears three times, with identical wording.

Here is the text:

Unexpected null – line 98
System.InvalidOperationException : Unexpected null – line 98
at Roslyn.Utilities.Contract.Fail(String message,Int32 lineNumber)
at Roslyn.Utilities.Contract.ThrowIfNull[T](T value,Int32 lineNumber)
at async Microsoft.CodeAnalysis.Remote.BrokeredServiceConne ction`1.RentServiceAsync[TService](<Unknown Parameters>)
at System.Runtime.ExceptionServices.ExceptionDispatch Info.Throw()
at System.Threading.Tasks.ValueTask`1.get_Result()
at async Microsoft.CodeAnalysis.Remote.BrokeredServiceConne ction`1.TryInvokeAsync[TService](<Unknown Parameters>)

I suspect the problem will be obvious to anyone with some experience coding for NT8. Unfortunately, I’m not him. Or her.

Could someone please tell me what is going on here and how to fix it?

Many thanks.