Fatal error. 0xE0004743

at System.String.Concat(System.String, System.String)

at Docfx.Dotnet.SymbolUrlResolver.GetMicrosoftLearnUrl(System.String, Boolean, Boolean, System.String)

at Docfx.Dotnet.SymbolUrlResolver.GetSymbolUrl(Microsoft.CodeAnalysis.ISymbol, Microsoft.CodeAnalysis.Compilation, Docfx.MemberLayout, Docfx.Dotnet.SymbolUrlKind, System.Collections.Generic.HashSet`1<Microsoft.CodeAnalysis.IAssemblySymbol>)

at Docfx.Dotnet.SymbolFormatter.<ToLinkItems>g__ToLinkItem|15_0(Microsoft.CodeAnalysis.SymbolDisplayPart, <>c__DisplayClass15_0 ByRef)

at Docfx.Dotnet.SymbolFormatter.ToLinkItems(System.Collections.Immutable.ImmutableArray`1<Microsoft.CodeAnalysis.SymbolDisplayPart>, Microsoft.CodeAnalysis.Compilation, Docfx.MemberLayout, System.Collections.Generic.HashSet`1<Microsoft.CodeAnalysis.IAssemblySymbol>, Boolean, Docfx.Dotnet.SymbolUrlKind)

at Docfx.Dotnet.YamlModelGenerator.GenerateReference(Microsoft.CodeAnalysis.ISymbol, Docfx.Dotnet.ReferenceItem, Boolean)

at Docfx.Dotnet.YamlModelGenerator.AddSpecReference(Microsoft.CodeAnalysis.ISymbol, System.Collections.Generic.IReadOnlyList`1<System.String>, System.Collections.Generic.IReadOnlyList`1<System.String>, System.Collections.Generic.Dictionary`2<System.String,Docfx.Dotnet.ReferenceItem>, Docfx.Dotnet.SymbolVisitorAdapter)

at Docfx.Dotnet.SymbolVisitorAdapter.GenerateExtensionMethods(Microsoft.CodeAnalysis.INamedTypeSymbol, Docfx.Dotnet.MetadataItem)