Bicep language server startup issue in visual studio

[bhsubra]

I am seeing issue in bicep language server startup in visual studio.

On debugging, I see below exception:
System.PlatformNotSupportedException
HResult=0x80131539
Message=Operation is not supported on this platform.
Source=System.Text.Encodings.Web
StackTrace:
at System.Text.Encodings.Web.OptimizedInboxTextEncoder.AllowedAsciiCodePoints.get_AsVector()

VS version:
17.5.0 Preview 5.0

Call stack:

	System.Text.Encodings.Web.dll!System.Text.Encodings.Web.OptimizedInboxTextEncoder.AllowedAsciiCodePoints.AsVector.get()	Unknown
 	System.Text.Encodings.Web.dll!System.Text.Encodings.Web.OptimizedInboxTextEncoder.GetIndexOfFirstByteToEncodeSsse3(byte* pData, nuint lengthInBytes)	Unknown
 	System.Text.Encodings.Web.dll!System.Text.Encodings.Web.OptimizedInboxTextEncoder.GetIndexOfFirstByteToEncode(System.ReadOnlySpan<byte> data)	Unknown
 	System.Text.Encodings.Web.dll!System.Text.Encodings.Web.DefaultJavaScriptEncoder.FindFirstCharacterToEncodeUtf8(System.ReadOnlySpan<byte> utf8Text)	Unknown
 	System.Text.Json.dll!System.Text.Json.JsonWriterHelper.NeedsEscaping(System.ReadOnlySpan<byte> value, System.Text.Encodings.Web.JavaScriptEncoder encoder)	Unknown
 	System.Text.Json.dll!System.Text.Json.JsonEncodedText.EncodeHelper(System.ReadOnlySpan<byte> utf8Value, System.Text.Encodings.Web.JavaScriptEncoder encoder)	Unknown
 	System.Text.Json.dll!System.Text.Json.JsonEncodedText.TranscodeAndEncode(System.ReadOnlySpan<char> value, System.Text.Encodings.Web.JavaScriptEncoder encoder)	Unknown
 	System.Text.Json.dll!System.Text.Json.JsonEncodedText.Encode(System.ReadOnlySpan<char> value, System.Text.Encodings.Web.JavaScriptEncoder encoder)	Unknown
 	System.Text.Json.dll!System.Text.Json.JsonEncodedText.Encode(string value, System.Text.Encodings.Web.JavaScriptEncoder encoder)	Unknown
>	Azure.Bicep.Types.dll!Azure.Bicep.Types.Serialization.TypeJsonContext.TypeJsonContext() Line 14	C#
 	[Native to Managed Transition]	
 	[Managed to Native Transition]	
 	Azure.Bicep.Types.dll!Azure.Bicep.Types.Serialization.TypeJsonContext.s_defaultOptions.get() Line 16	C#
 	Azure.Bicep.Types.dll!Azure.Bicep.Types.Serialization.TypeJsonContext.TypeJsonContext() Line 35	C#
 	System.Private.CoreLib.dll!System.Activator.CreateInstance<Azure.Bicep.Types.Serialization.TypeJsonContext>() Line 140	C#
 	System.Text.Json.dll!System.Text.Json.JsonSerializerOptions.AddContext<Azure.Bicep.Types.Serialization.TypeJsonContext>()	Unknown
 	Azure.Bicep.Types.dll!Azure.Bicep.Types.Serialization.TypeBaseConverter.TypeBaseConverter(Azure.Bicep.Types.Concrete.TypeFactory factory) Line 18	C#
 	Azure.Bicep.Types.dll!Azure.Bicep.Types.Serialization.TypeJsonContext.GetSerializerOptions(Azure.Bicep.Types.Concrete.TypeFactory factory) Line 26	C#
 	Azure.Bicep.Types.dll!Azure.Bicep.Types.Serialization.TypeSerializer.DeserializeIndex(System.IO.Stream contentStream) Line 36	C#
 	Azure.Bicep.Types.dll!Azure.Bicep.Types.TypeLoader.LoadTypeIndex() Line 42	C#
 	Azure.Bicep.Core.dll!Bicep.Core.TypeSystem.Az.AzResourceTypeLoader.AzResourceTypeLoader() Line 25	C#
 	[Native to Managed Transition]	
 	[Managed to Native Transition]	
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Interpreter.TryInterpret(DryIoc.IResolverContext r, DryIoc.FastExpressionCompiler.LightExpression.Expression expr, DryIoc.FastExpressionCompiler.LightExpression.IParameterProvider paramExprs, object paramValues, DryIoc.Interpreter.ParentLambdaArgs parentArgs, out object result)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Interpreter.TryInterpretAndUnwrapContainerException(DryIoc.IResolverContext r, DryIoc.FastExpressionCompiler.LightExpression.Expression expr, out object result)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Factory.ApplyReuse(DryIoc.FastExpressionCompiler.LightExpression.Expression serviceExpr, DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Factory.GetExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.ReflectionFactory.CreateExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Factory.GetExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.ReflectionFactory.CreateExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Factory.GetExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.ReflectionFactory.CreateExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Factory.GetExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.ReflectionFactory.CreateExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Factory.GetExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Rules.ConcreteTypeDynamicRegistrations.AnonymousMethod__2(DryIoc.Request req)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Container.GetRuleSelectedServiceFactoryOrDefault(DryIoc.Rules rules, DryIoc.ImTools.ImHashMap<System.Type, object> serviceFactories, DryIoc.Request request, DryIoc.ServiceDetails details, System.Type serviceType)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Container.DryIoc.IContainer.GetServiceFactoryOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Container.DryIoc.IContainer.ResolveFactory(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Container.ResolveAndCache(int serviceTypeHash, System.Type serviceType, DryIoc.IfUnresolved ifUnresolved)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Container.DryIoc.IResolver.Resolve(System.Type serviceType, DryIoc.IfUnresolved ifUnresolved)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!OmniSharp.Extensions.JsonRpc.JsonRpcHandlerCollectionExtensions.Populate(OmniSharp.Extensions.JsonRpc.IJsonRpcHandlerCollection collection, DryIoc.IResolverContext resolverContext, OmniSharp.Extensions.JsonRpc.IHandlersManager handlersManager)	Unknown
 	OmniSharp.Extensions.LanguageServer.Shared.dll!OmniSharp.Extensions.LanguageServer.Shared.LanguageProtocolServiceCollectionExtensions.AddLanguageProtocolInternals.AnonymousMethod__0_2(OmniSharp.Extensions.LanguageServer.Shared.SharedHandlerCollection manager, DryIoc.IResolverContext context)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Registrator.Initializer<OmniSharp.Extensions.LanguageServer.Shared.SharedHandlerCollection, OmniSharp.Extensions.LanguageServer.Shared.SharedHandlerCollection>(OmniSharp.Extensions.LanguageServer.Shared.SharedHandlerCollection service, DryIoc.IResolverContext resolver, System.Action<OmniSharp.Extensions.LanguageServer.Shared.SharedHandlerCollection, DryIoc.IResolverContext> initialize)	Unknown
 	[Native to Managed Transition]	
 	[Managed to Native Transition]	
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Interpreter.TryInterpretMethodCall(DryIoc.IResolverContext r, DryIoc.FastExpressionCompiler.LightExpression.MethodCallExpression callExpr, DryIoc.FastExpressionCompiler.LightExpression.IParameterProvider paramExprs, object paramValues, DryIoc.Interpreter.ParentLambdaArgs parentArgs, ref object result)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Interpreter.TryInterpret(DryIoc.IResolverContext r, DryIoc.FastExpressionCompiler.LightExpression.Expression expr, DryIoc.FastExpressionCompiler.LightExpression.IParameterProvider paramExprs, object paramValues, DryIoc.Interpreter.ParentLambdaArgs parentArgs, out object result)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Interpreter.TryInterpretAndUnwrapContainerException(DryIoc.IResolverContext r, DryIoc.FastExpressionCompiler.LightExpression.Expression expr, out object result)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Factory.ApplyReuse(DryIoc.FastExpressionCompiler.LightExpression.Expression serviceExpr, DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Factory.GetExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Container.DryIoc.IContainer.GetDecoratorExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Factory.GetExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.ReflectionFactory.CreateExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Factory.GetExpressionOrDefault(DryIoc.Request request)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Container.ResolveAndCache(int serviceTypeHash, System.Type serviceType, DryIoc.IfUnresolved ifUnresolved)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Container.DryIoc.IResolver.Resolve(System.Type serviceType, DryIoc.IfUnresolved ifUnresolved)	Unknown
 	OmniSharp.Extensions.JsonRpc.dll!DryIoc.Resolver.Resolve<OmniSharp.Extensions.LanguageServer.Server.LanguageServer>(DryIoc.IResolver resolver, DryIoc.IfUnresolved ifUnresolved)	Unknown
 	OmniSharp.Extensions.LanguageServer.dll!OmniSharp.Extensions.LanguageServer.Server.LanguageServer.Create(OmniSharp.Extensions.LanguageServer.Server.LanguageServerOptions options, System.IServiceProvider outerServiceProvider)	Unknown
 	OmniSharp.Extensions.LanguageServer.dll!OmniSharp.Extensions.LanguageServer.Server.LanguageServer.Create(System.Action<OmniSharp.Extensions.LanguageServer.Server.LanguageServerOptions> optionsAction, System.IServiceProvider outerServiceProvider)	Unknown
 	OmniSharp.Extensions.LanguageServer.dll!OmniSharp.Extensions.LanguageServer.Server.LanguageServer.Create(System.Action<OmniSharp.Extensions.LanguageServer.Server.LanguageServerOptions> optionsAction)	Unknown
 	OmniSharp.Extensions.LanguageServer.dll!OmniSharp.Extensions.LanguageServer.Server.LanguageServer.PreInit(System.Action<OmniSharp.Extensions.LanguageServer.Server.LanguageServerOptions> optionsAction)	Unknown
 	Bicep.LangServer.dll!Bicep.LanguageServer.Server.Server(System.Action<OmniSharp.Extensions.LanguageServer.Server.LanguageServerOptions> onOptionsFunc) Line 51	C#
 	Bicep.LangServer.dll!Bicep.LanguageServer.Program.RunServer(Bicep.LanguageServer.Program.CommandLineOptions options, System.Threading.CancellationToken cancellationToken) Line 99	C#
 	Bicep.LangServer.dll!Bicep.LanguageServer.Program.Main.AnonymousMethod__3(Bicep.LanguageServer.Program.CommandLineOptions options) Line 46	C#
 	CommandLine.dll!CommandLine.ParserResultExtensions.WithParsedAsync<Bicep.LanguageServer.Program.CommandLineOptions>(CommandLine.ParserResult<Bicep.LanguageServer.Program.CommandLineOptions> result, System.Func<Bicep.LanguageServer.Program.CommandLineOptions, System.Threading.Tasks.Task> action)	Unknown
 	Bicep.LangServer.dll!Bicep.LanguageServer.Program.Main.AnonymousMethod__0(System.Threading.CancellationToken cancellationToken) Line 44	C#
 	Bicep.LangServer.dll!Bicep.LanguageServer.Program.RunWithCancellationAsync(System.Func<System.Threading.CancellationToken, System.Threading.Tasks.Task> runFunc) Line 127	C#
 	Bicep.LangServer.dll!Bicep.LanguageServer.Program.Main(string[] args) Line 34	C#
 	Bicep.LangServer.dll!Bicep.LanguageServer.Program.<Main>(string[] args)	Unknown

[bhsubra]

Closing this as the issue was on VS client side.