Error: Microsoft.AspNetCore.Razor.OmniSharpPlugin fails to load

Issue Description

One day, the following error came to occur at startup. What is the cause?

System.TypeLoadException: VTable setup of type Microsoft.AspNetCore.Razor.OmniSharpPlugin.OmniSharpPluginStrongNamedRoslynServiceProvider failed
  at (wrapper managed-to-native) System.RuntimeType.GetPropertiesByName_native(System.RuntimeType,intptr,System.Reflection.BindingFlags,bool)
  at System.RuntimeType.GetPropertiesByName (System.String name, System.Reflection.BindingFlags bindingAttr, System.Boolean icase, System.RuntimeType reflectedType) [0x0001b] in <98fac219bd4e453693d76fda7bd96ab0>:0 
  at System.RuntimeType.GetPropertyCandidates (System.String name, System.Reflection.BindingFlags bindingAttr, System.Type[] types, System.Boolean allowPrefixLookup) [0x00010] in <98fac219bd4e453693d76fda7bd96ab0>:0 
  at System.RuntimeType.GetProperties (System.Reflection.BindingFlags bindingAttr) [0x00000] in <98fac219bd4e453693d76fda7bd96ab0>:0 
  at System.Reflection.RuntimeReflectionExtensions.GetRuntimeProperties (System.Type type) [0x00006] in <98fac219bd4e453693d76fda7bd96ab0>:0 
  at System.Composition.TypedParts.Discovery.TypeInspector+<DiscoverPropertyExports>d__7.MoveNext () [0x00030] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.TypedParts.Discovery.TypeInspector+<DiscoverExports>d__5.MoveNext () [0x000dc] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.TypedParts.Discovery.TypeInspector.InspectTypeForPart (System.Reflection.TypeInfo type, System.Composition.TypedParts.Discovery.DiscoveredPart& part) [0x00061] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.TypedParts.TypedPartExportDescriptorProvider..ctor (System.Collections.Generic.IEnumerable`1[T] types, System.Composition.Convention.AttributedModelProvider attributeContext) [0x00037] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.Hosting.ContainerConfiguration.CreateContainer () [0x00042] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at OmniSharp.CompositionHostBuilder.Build () [0x001ed] in <c228582629e34359bfdbc0fc855c1d2f>:0 
  at OmniSharp.Stdio.Host..ctor (System.IO.TextReader input, OmniSharp.Stdio.Services.ISharedTextWriter writer, OmniSharp.IOmniSharpEnvironment environment, Microsoft.Extensions.Configuration.IConfiguration configuration, System.IServiceProvider serviceProvider, OmniSharp.CompositionHostBuilder compositionHostBuilder, Microsoft.Extensions.Logging.ILoggerFactory loggerFactory, System.Threading.CancellationTokenSource cancellationTokenSource) [0x0007e] in <19355510af164339b7bccd4ca09bc44c>:0 
  at OmniSharp.Stdio.Driver.Program+<>c__DisplayClass0_1.<Main>b__1 () [0x00117] in <ba7fbbf8e8fb4043b79656a74082347f>:0 
  at OmniSharp.CommandLineApplication+<>c__DisplayClass11_0.<OnExecute>b__0 () [0x0000b] in <c228582629e34359bfdbc0fc855c1d2f>:0 
  at McMaster.Extensions.CommandLineUtils.CommandLineApplication.Execute (System.String[] args) [0x00039] in <344a1e8cd6594b17b1e01f8df6ae8827>:0 
  at OmniSharp.CommandLineApplication.Execute (System.Collections.Generic.IEnumerable`1[T] args) [0x00042] in <c228582629e34359bfdbc0fc855c1d2f>:0 
  at OmniSharp.Stdio.Driver.Program+<>c__DisplayClass0_0.<Main>b__0 () [0x00028] in <ba7fbbf8e8fb4043b79656a74082347f>:0 
  at OmniSharp.HostHelpers.Start (System.Func`1[TResult] action) [0x0001c] in <c228582629e34359bfdbc0fc855c1d2f>:0 
[ERROR] Error: OmniSharp server load timed out. Use the 'omnisharp.projectLoadTimeout' setting to override the default delay (one minute).

Environment information

VSCode version: 1.32.3 C# Extension: 1.19.0

Mono Information

OmniSharp using global mono :5.16.0

Dotnet Information

.NET Command Line Tools (2.1.2)

Product Information: Version: 2.1.2 Commit SHA-1 hash: 5695315371

Runtime Environment: OS Name: Mac OS X OS Version: 10.13 OS Platform: Darwin RID: osx.10.12-x64 Base Path: /usr/local/share/dotnet/sdk/2.1.2/

Microsoft .NET Core Shared Framework Host

Version : 2.0.3 Build : a9190d4a75f4a982ae4b4fa8d1a24526566c69df

Visual Studio Code Extensions

Extension	Author	Version
bracket-pair-colorizer	CoenraadS	1.0.61
classynaming	reflectiondm	1.2.0
code-spell-checker	streetsidesoftware	1.7.1
csharp	ms-vscode	1.19.0
dart-code	Dart-Code	2.25.1
docomment	k–kato	0.1.6
flutter	Dart-Code	2.25.1
plantuml	jebbs	2.10.9
unity-debug	Unity	2.7.2
view-in-browser	qinjia	0.0.5
vscode-language-pack-ja	MS-CEINTL	1.33.2

[filipw]

great! 👍👍

[ghkawa]

It was set to "omnisharp.path": "1.32.3-beta.9", so delete it and solve the problem. Thank you for your help.