Auto completion isn't working on .csx file

[wk-j]

Environment data

dotnet --info output:

.NET Core SDK (reflecting any global.json):
 Version:   2.1.300-preview2-008530
 Commit:    822ae6d43a

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  10.13
 OS Platform: Darwin
 RID:         osx.10.13-x64
 Base Path:   /usr/local/share/dotnet/sdk/2.1.300-preview2-008530/

Host (useful for support):
  Version: 2.1.0-rc1
  Commit:  eb9bc92051

.NET Core SDKs installed:
  2.1.4 [/usr/local/share/dotnet/sdk]
  2.1.300-preview1-008174 [/usr/local/share/dotnet/sdk]
  2.1.300-preview2-008530 [/usr/local/share/dotnet/sdk]
  2.1.300-rc1-008673 [/usr/local/share/dotnet/sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.0-preview1-final [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.0-preview2-final [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.0-rc1-final [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.0-preview1-final [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.0-preview2-final [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.0-rc1-final [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.0.5 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.0-preview1-26216-03 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.0-preview2-26406-04 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.0-rc1 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App

VS Code version:

1.23.1
d0182c3417d225529c6d5ad24b7572815d0de9ac
x64

C# Extension version:

ms-vscode.csharp-1.15.1

Steps to reproduce

Create Hello.csx and put this content

using System;
Console.WriteLine("Hello, world!");

Expected behavior

Auto completion working correctly

Actual behavior

No auto completion, syntax checker also not working

Log

Starting OmniSharp server at 5/12/2018, 4:37:26 PM
    Target: /Users/wk/Source/Hello

OmniSharp server started
    Path: /Users/wk/.vscode/extensions/ms-vscode.csharp-1.15.1/.omnisharp/1.30.0/run
    PID: 2808

[info]: OmniSharp.Stdio.Host
        Starting OmniSharp on MacOS 10.13.3 (x64)
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Located 1 MSBuild instance(s)
            1: StandAlone 15.0 - "/Users/wk/.vscode/extensions/ms-vscode.csharp-1.15.1/.omnisharp/1.30.0/omnisharp/msbuild/15.0/Bin"
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        MSBUILD_EXE_PATH environment variable set to '/Users/wk/.vscode/extensions/ms-vscode.csharp-1.15.1/.omnisharp/1.30.0/omnisharp/msbuild/15.0/Bin/MSBuild.dll'
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Registered MSBuild instance: StandAlone 15.0 - "/Users/wk/.vscode/extensions/ms-vscode.csharp-1.15.1/.omnisharp/1.30.0/omnisharp/msbuild/15.0/Bin"
            MSBuildExtensionsPath = /Library/Frameworks/Mono.framework/Versions/5.4.1/lib/mono/xbuild
            BypassFrameworkInstallChecks = true
            CscToolPath = /Users/wk/.vscode/extensions/ms-vscode.csharp-1.15.1/.omnisharp/1.30.0/omnisharp/msbuild/15.0/Bin/Roslyn
            CscToolExe = csc.exe
            MSBuildToolsPath = /Users/wk/.vscode/extensions/ms-vscode.csharp-1.15.1/.omnisharp/1.30.0/omnisharp/msbuild/15.0/Bin
            TargetFrameworkRootPath = /Library/Frameworks/Mono.framework/Versions/5.4.1/lib/mono/xbuild-frameworks
[info]: OmniSharp.Cake.CakeProjectSystem
        Detecting Cake files in '/Users/wk/Source/Hello'.
[info]: OmniSharp.Cake.CakeProjectSystem
        Could not find any Cake files
[info]: OmniSharp.DotNet.DotNetProjectSystem
        Initializing in /Users/wk/Source/Hello
[info]: OmniSharp.DotNet.DotNetProjectSystem
        Auto package restore: False
[info]: OmniSharp.DotNet.DotNetProjectSystem
        Update workspace context
[info]: OmniSharp.DotNet.DotNetProjectSystem
        Resolving projects references
[info]: OmniSharp.MSBuild.ProjectSystem
        No solution files found in '/Users/wk/Source/Hello'
[info]: OmniSharp.Script.ScriptProjectSystem
        Detecting CSX files in '/Users/wk/Source/Hello'.
[info]: OmniSharp.Script.ScriptProjectSystem
        Found 1 CSX files.
[info]: OmniSharp.Script.ScriptProjectSystem
        Searching for compilation dependencies with the fallback framework of 'net46'.
[info]: OmniSharp.Script.ScriptProjectSystem
        Unable to find dependency context for CSX files. Will default to non-context usage (Desktop CLR scripts).
[fail]: OmniSharp.Stdio.Host
        The project system 'OmniSharp.Script.ScriptProjectSystem' threw exception during initialization.
System.InvalidOperationException: Cannot find reference assembly 'Microsoft.CodeAnalysis.CSharp.dll' file for package Microsoft.CodeAnalysis.CSharp.Reference
  at Microsoft.Extensions.DependencyModel.Resolution.ReferenceAssemblyPathResolver.TryResolveAssemblyPaths (Microsoft.Extensions.DependencyModel.CompilationLibrary library, System.Collections.Generic.List`1[T] assemblies) [0x00046] in <43391b1e7c3f430bb096ac6ec60bb276>:0 
  at Microsoft.Extensions.DependencyModel.Resolution.CompositeCompilationAssemblyResolver.TryResolveAssemblyPaths (Microsoft.Extensions.DependencyModel.CompilationLibrary library, System.Collections.Generic.List`1[T] assemblies) [0x0000f] in <43391b1e7c3f430bb096ac6ec60bb276>:0 
  at Microsoft.Extensions.DependencyModel.CompilationLibrary.ResolveReferencePaths (Microsoft.Extensions.DependencyModel.Resolution.ICompilationAssemblyResolver resolver, System.Collections.Generic.List`1[T] assemblies) [0x00000] in <43391b1e7c3f430bb096ac6ec60bb276>:0 
  at Microsoft.Extensions.DependencyModel.CompilationLibrary.ResolveReferencePaths () [0x0000c] in <43391b1e7c3f430bb096ac6ec60bb276>:0 
  at OmniSharp.Script.ScriptProjectSystem+<>c.<Initalize>b__22_3 (Microsoft.Extensions.DependencyModel.CompilationLibrary x) [0x00000] in <639a01402a864f1c988790c921d4193f>:0 
  at System.Linq.Enumerable+SelectManySingleSelectorIterator`2[TSource,TResult].MoveNext () [0x00051] in <b29fa38c592649ee8d566c045a7d9307>:0 
  at OmniSharp.Script.ScriptProjectSystem.Initalize (Microsoft.Extensions.Configuration.IConfiguration configuration) [0x0023c] in <639a01402a864f1c988790c921d4193f>:0 
  at OmniSharp.WorkspaceInitializer.Initialize (System.IServiceProvider serviceProvider, System.Composition.Hosting.CompositionHost compositionHost, Microsoft.Extensions.Configuration.IConfiguration configuration, Microsoft.Extensions.Logging.ILogger logger) [0x00079] in <a906f848854547a083bd348961e348e4>:0 
[info]: OmniSharp.Stdio.Host
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpWorkspaceOptionsProvider
[info]: OmniSharp.Stdio.Host
        Configuration finished.
[info]: OmniSharp.Stdio.Host
        Omnisharp server running using Stdio at location '/Users/wk/Source/Hello' on host 2781.

[seesharper]

You are probably being hit by this OmniSharp/omnisharp-roslyn#1184
Try installing the latest beta
https://github.com/OmniSharp/omnisharp-vscode/releases/tag/v1.15.2-beta1

Alternatively in VS Code settings

"omnisharp.path":"latest"

[wk-j]

Thanks @seesharper
Installing v1.15.2-beta1 fixed the problem

[DustinCampbell]

Great! Thanks for verifying @wk-j.