Namespaces gone missing - VS2022 - visual-studio

Update - seems to be a computer problem? Even when I created a new project, same errors appear immediately. But I did not make any changes to computer.
It is a asp.net core blazor webassembly project. I have been working on it for some days. Today several namespaces went "missing".
What I have tried:
Uninstall the nuget packages and then reinstall didn't solve it.
Restart visual studio didn't help
Reboot computer didn't help
Cleared nuget cache as mentioned here didn't help.
Ran a git restore . to rollback changes didn't help.
Delete bin and obj folder then rebuild didn't help.
donet restore command didn't help
The .csproj file content is:
<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
<PropertyGroup>
<TargetFramework>net6.0</TargetFramework>
<Nullable>enable</Nullable>
<ImplicitUsings>enable</ImplicitUsings>
<ServiceWorkerAssetsManifest>service-worker-assets.js</ServiceWorkerAssetsManifest>
<!--<RunAOTCompilation>true</RunAOTCompilation>-->
<PublishTrimmed>false</PublishTrimmed>
</PropertyGroup>
<ItemGroup>
<Compile Remove="Pages\Index.razor.cs" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="Blazored.LocalStorage" Version="4.2.0" />
<PackageReference Include="BlazorWasmAntivirusProtection" Version="1.8.5" />
<PackageReference Include="Microsoft.AspNetCore.Components.Authorization" Version="6.0.10" />
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="6.0.10" />
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Authentication" Version="6.0.10" />
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="6.0.10" PrivateAssets="all" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\Shared\BlazorApp.Shared.csproj" />
</ItemGroup>
<ItemGroup>
<ServiceWorker Include="wwwroot\service-worker.js" PublishedContent="wwwroot\service-worker.published.js" />
</ItemGroup>
</Project>
Build output error text:
Rebuild started...
Restored C:\some\path\Shared\BlazorApp.Shared.csproj (in 2 ms).
1>------ Rebuild All started: Project: BlazorApp.Shared, Configuration: Debug Any CPU ------
Restored C:\some\path\Server\BlazorApp.Server.csproj (in 87 ms).
Restored C:\some\path\Client\BlazorApp.Client.csproj (in 87 ms).
1>C:\some\path\Shared\SharedFunctions.cs(51,17,51,18): warning CS0642: Possible mistaken empty statement
1>BlazorApp.Shared -> C:\some\path\Shared\bin\Debug\net6.0\BlazorApp.Shared.dll
1>Done building project "BlazorApp.Shared.csproj".
2>------ Rebuild All started: Project: BlazorApp.Client, Configuration: Debug Any CPU ------
2>C:\some\path\Client\App.razor(1,1,1,45): warning RZ10012: Found markup element with unexpected name 'Router'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\App.razor(2,5,2,32): warning RZ10012: Found markup element with unexpected name 'Found'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\App.razor(3,9,3,81): warning RZ10012: Found markup element with unexpected name 'RouteView'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\App.razor(4,9,4,65): warning RZ10012: Found markup element with unexpected name 'FocusOnNavigate'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\App.razor(6,5,6,15): warning RZ10012: Found markup element with unexpected name 'NotFound'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\App.razor(7,9,7,20): warning RZ10012: Found markup element with unexpected name 'PageTitle'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\App.razor(8,9,8,50): warning RZ10012: Found markup element with unexpected name 'LayoutView'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Pages\Counter.razor(3,1,3,12): warning RZ10012: Found markup element with unexpected name 'PageTitle'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Pages\FetchData.razor(5,1,5,12): warning RZ10012: Found markup element with unexpected name 'PageTitle'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Pages\Index.razor(5,1,5,12): warning RZ10012: Found markup element with unexpected name 'PageTitle'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Pages\LogIn.razor(15,1,15,91): warning RZ10012: Found markup element with unexpected name 'EditForm'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Pages\LogIn.razor(16,5,16,31): warning RZ10012: Found markup element with unexpected name 'DataAnnotationsValidator'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Pages\LogIn.razor(17,5,17,24): warning RZ10012: Found markup element with unexpected name 'ValidationSummary'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Pages\LogIn.razor(22,13,22,84): warning RZ10012: Found markup element with unexpected name 'InputText'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Pages\LogIn.razor(23,13,23,58): warning RZ10012: Found markup element with unexpected name 'ValidationMessage'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Pages\LogIn.razor(30,13,30,104): warning RZ10012: Found markup element with unexpected name 'InputText'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Pages\LogIn.razor(31,13,31,60): warning RZ10012: Found markup element with unexpected name 'ValidationMessage'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Shared\MainLayout.razor(5,9,5,20): warning RZ10012: Found markup element with unexpected name 'NavMenu'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Shared\NavMenu.razor(13,13,13,72): warning RZ10012: Found markup element with unexpected name 'NavLink'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Shared\NavMenu.razor(18,13,18,54): warning RZ10012: Found markup element with unexpected name 'NavLink'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Shared\NavMenu.razor(23,13,23,56): warning RZ10012: Found markup element with unexpected name 'NavLink'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Shared\NavMenu.razor(28,13,28,52): warning RZ10012: Found markup element with unexpected name 'NavLink'. If this is intended to be a component, add a #using directive for its namespace.
2>C:\some\path\Client\Authentication\AuthenticationService.cs(1,7,1,15): error CS0246: The type or namespace name 'Blazored' could not be found (are you missing a using directive or an assembly reference?)
2>C:\some\path\Client\Authentication\AuthenticationService.cs(2,28,2,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Authentication\AuthStateProvider.cs(1,7,1,15): error CS0246: The type or namespace name 'Blazored' could not be found (are you missing a using directive or an assembly reference?)
2>C:\some\path\Client\Authentication\AuthStateProvider.cs(2,28,2,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Program.cs(1,7,1,15): error CS0246: The type or namespace name 'Blazored' could not be found (are you missing a using directive or an assembly reference?)
2>C:\some\path\Client\Program.cs(2,28,2,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Program.cs(3,28,3,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Program.cs(4,28,4,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Microsoft.NET.Sdk.Razor.SourceGenerators\Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator\App_razor.g.cs(11,32,11,42): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(3,28,3,41): error CS0234: The type or namespace name 'Authorization' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(4,28,4,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(5,28,5,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(6,28,6,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(7,28,7,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(8,28,8,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(9,28,9,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Microsoft.NET.Sdk.Razor.SourceGenerators\Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator\_Imports_razor.g.cs(11,32,11,42): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(3,28,3,41): error CS0234: The type or namespace name 'Authorization' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(4,28,4,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(5,28,5,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(6,28,6,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(7,28,7,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(8,28,8,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(9,28,9,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Microsoft.NET.Sdk.Razor.SourceGenerators\Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator\_Imports_razor.g.cs(110,58,110,68): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Microsoft.NET.Sdk.Razor.SourceGenerators\Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator\App_razor.g.cs(110,53,110,63): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Microsoft.NET.Sdk.Razor.SourceGenerators\Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator\_Imports_razor.g.cs(113,70,113,80): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Microsoft.NET.Sdk.Razor.SourceGenerators\Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator\App_razor.g.cs(113,70,113,80): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Authentication\AuthStateProvider.cs(9,38,9,65): error CS0246: The type or namespace name 'AuthenticationStateProvider' could not be found (are you missing a using directive or an assembly reference?)
2>C:\some\path\Client\Microsoft.NET.Sdk.Razor.SourceGenerators\Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator\Shared_SurveyPrompt_razor.g.cs(11,32,11,42): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(3,28,3,41): error CS0234: The type or namespace name 'Authorization' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(4,28,4,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(5,28,5,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(6,28,6,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(7,28,7,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(8,28,8,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(9,28,9,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Microsoft.NET.Sdk.Razor.SourceGenerators\Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator\Pages_Counter_razor.g.cs(11,32,11,42): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(3,28,3,41): error CS0234: The type or namespace name 'Authorization' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(4,28,4,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(5,28,5,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(6,28,6,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(7,28,7,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(8,28,8,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(9,28,9,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Authentication\AuthStateProvider.cs(12,26,12,46): error CS0246: The type or namespace name 'ILocalStorageService' could not be found (are you missing a using directive or an assembly reference?)
2>C:\some\path\Client\Authentication\AuthenticationService.cs(13,26,13,53): error CS0246: The type or namespace name 'AuthenticationStateProvider' could not be found (are you missing a using directive or an assembly reference?)
2>C:\some\path\Client\Authentication\AuthenticationService.cs(14,26,14,46): error CS0246: The type or namespace name 'ILocalStorageService' could not be found (are you missing a using directive or an assembly reference?)
2>C:\some\path\Client\Microsoft.NET.Sdk.Razor.SourceGenerators\Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator\Shared_MainLayout_razor.g.cs(11,32,11,42): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(3,28,3,41): error CS0234: The type or namespace name 'Authorization' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(4,28,4,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(5,28,5,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(6,28,6,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(7,28,7,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(8,28,8,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(9,28,9,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\Authentication\AuthStateProvider.cs(14,26,14,45): error CS0246: The type or namespace name 'AuthenticationState' could not be found (are you missing a using directive or an assembly reference?)
2>C:\some\path\Client\Microsoft.NET.Sdk.Razor.SourceGenerators\Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator\Pages_FetchData_razor.g.cs(11,32,11,42): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(3,28,3,41): error CS0234: The type or namespace name 'Authorization' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)
2>C:\some\path\Client\_Imports.razor(4,28,4,38): error CS0234: The type or namespace name 'Components' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?)


You can try to check _Import.razor:
#using System.Net.Http
#using System.Net.Http.Json
#using Microsoft.AspNetCore.Components.Forms
#using Microsoft.AspNetCore.Components.Routing
#using Microsoft.AspNetCore.Components.Web
#using Microsoft.AspNetCore.Components.Web.Virtualization
#using Microsoft.AspNetCore.Components.WebAssembly.Http
#using Microsoft.JSInterop
#using BlazorApp1
#using BlazorApp1.Shared
I get this error if delete these in _Import.razor, maybe it can help you.

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(C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 3\Assemblies)
Here is a selection of the messages:
Controllers\AccountController.cs(7, 18): error CS0234: The type or namespace name 'Mvc' does not exist in the namespace 'System.Web' (are you missing an assembly reference?)
Controllers\AccountController.cs(15, 35): error CS0246: The type or namespace name 'Controller' could not be found (are you missing a using directive or an assembly reference?)
Controllers\HomeController.cs(5, 18): error CS0234: The type or namespace name 'Mvc' does not exist in the namespace 'System.Web' (are you missing an assembly reference?)
Controllers\HomeController.cs(9, 32): error CS0246: The type or namespace name 'Controller' could not be found (are you missing a using directive or an assembly reference?)
Global.asax.cs(5, 18): error CS0234: The type or namespace name 'Mvc' does not exist in the namespace 'System.Web' (are you missing an assembly reference?)
Models\AccountModels.cs(8, 18): error CS0234: The type or namespace name 'Mvc' does not exist in the namespace 'System.Web' (are you missing an assembly reference?)
So what am I missing?

The errors you seem to be inferring that it can't find the correct version of the MVC dll. Is it possible you've installed the MVC (original) or MVC2 instead of the MVC3 from the web platform onto the build server?
Edit:
Also the file should be in the GAC, (not sure the location on Win Server 2008 but guessing it's similar to Win 7.)
C:\Windows\Microsoft.NET\assembly\GAC_MSIL\System.Web.Mvc\ (then the .Net version folder, mine is v4.0_3.0.0.0)

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