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Ask questionsLSC: Installed workload - language features don't work

I've made a build of VS and the language server doesn't start, editor LS features are working, obviously.

Activity log has these entries:

Still unable to load MEF component DLL: Could not load file or assembly 'Microsoft.Windows.Design.Extensibility, Version=4.3.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
          C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PREVIEW\COMMON7\IDE\COMMONEXTENSIONS\DATADESIGN\Microsoft.VisualStudio.DataDesign.WpfComponents.dll
Still unable to load MEF component DLL: Could not load file or assembly 'Microsoft.Windows.Design.Host, Version=4.3.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
          C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PREVIEW\COMMON7\IDE\EXTENSIONS\MICROSOFT\PYTHON\CORE\Microsoft.PythonTools.XamlDesignerSupport.dll
Still unable to load MEF component DLL: Could not load file or assembly 'Microsoft.VisualStudio.ProjectSystem.Managed.VS, Version=16.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
          C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PREVIEW\COMMON7\IDE\EXTENSIONS\MICROSOFT\WEB TOOLS\Package Management\Microsoft.WebTools.PackageManagement.dll
Still unable to load MEF component DLL: Could not load file or assembly 'Microsoft.VisualStudio.TextTemplating.Interfaces.11.0, Version=11.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
          c:\program files (x86)\microsoft visual studio\2019\preview\common7\ide\extensions\microsoft\web tools\scaffolding\Microsoft.AspNet.Scaffolding.12.0.dll
Still unable to load MEF component DLL: Could not load file or assembly 'Microsoft.VisualStudio.LiveShare.Razor, Version=3.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' or one of its dependencies. The system cannot find the file specified.
          C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PREVIEW\COMMON7\IDE\EXTENSIONS\MICROSOFT\LIVESHARE\Microsoft.VisualStudio.LiveShare.Razor.dll
Still unable to load MEF component DLL: Could not load file or assembly 'Microsoft.Windows.Simulator.Client, Version=16.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
          c:\program files (x86)\microsoft visual studio\2019\preview\common7\ide\commonextensions\platform\diagnosticshub\Microsoft.DiagnosticsHub.VisualStudio.Package.dll
Still unable to load MEF component DLL: Could not load file or assembly 'Microsoft.VisualStudio.ProjectSystem.Managed, Version=16.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
          C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PREVIEW\COMMON7\IDE\EXTENSIONS\MICROSOFT\LIVESHARE\Microsoft.VisualStudio.LiveShare.CPS.16.0.dll
Still unable to load MEF component DLL: Could not load file or assembly 'Microsoft.VisualStudio.ProjectSystem.Managed.VS, Version=16.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
          c:\program files (x86)\microsoft visual studio\2019\preview\common7\ide\extensions\microsoft\web tools\projectsystem\Microsoft.WebTools.ProjectSystem.dll
microsoft/PTVS

Answer questions huguesv

Looks like the same root cause as https://github.com/microsoft/PTVS/issues/5888 Internal issue 1026382

useful!
source:https://uonfu.com/
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