System.NotImplementedException : The method or operation is not implemented.
at Microsoft.CodeAnalysis.CodeActions.CodeAction.GetChangedDocumentAsync(CancellationToken cancellationToken)
at async Microsoft.CodeAnalysis.CodeActions.CodeAction.GetChangedSolutionAsync(<Unknown Parameters>)
at async Microsoft.CodeAnalysis.AddMissingImports.AbstractAddMissingImportsFeatureService.GetChangesForCodeActionAsync(<Unknown Parameters>)
at async Microsoft.CodeAnalysis.AddMissingImports.AbstractAddMissingImportsFeatureService.ApplyFixesAsync(<Unknown Parameters>)
at async Microsoft.CodeAnalysis.AddMissingImports.AbstractAddMissingImportsFeatureService.AddMissingImportsAsync(<Unknown Parameters>)
at async Microsoft.CodeAnalysis.AddMissingImports.AbstractAddMissingImportsRefactoringProvider.AddMissingImports(<Unknown Parameters>)
at async Microsoft.CodeAnalysis.CodeActions.CodeAction.ComputeOperationsAsync(<Unknown Parameters>)
at async Microsoft.CodeAnalysis.CodeActions.CodeAction.GetPreviewOperationsAsync(<Unknown Parameters>)
at async Microsoft.CodeAnalysis.Editor.Implementation.Suggestions.SuggestedAction.GetPreviewResultAsync(<Unknown Parameters>)
at async Microsoft.CodeAnalysis.Editor.Implementation.Suggestions.SuggestedActionWithNestedFlavors.<>c__DisplayClass11_0.<GetPreviewAsync>b__0(<Unknown Parameters>)
at async Microsoft.CodeAnalysis.Extensions.IExtensionManagerExtensions.PerformFunctionAsync[T](<Unknown Parameters>)
at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)
Hit this when i tired to copy the code from https://docs.microsoft.com/en-us/dotnet/api/system.windows.media.formattedtext?view=netframework-4.7.2 to a class filein console application