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I just upgraded to VS2022 Preview 4. Now when I load my Blazor project, I get the following error:
error : The project file cannot be opened. The SDK resolver "Microsoft.DotNet.MSBuildSdkResolver" failed to run. Could not find file 'C:\Program Files\dotnet\sdk-manifests\6.0.100\microsoft.net.sdk.macos\WorkloadManifest.json'.
I am not even using MacOS. I am Windows and on Preview 3 I had no issues.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(153.6, 47%, 24%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EEK%3C/text%3E%3C/svg%3E)
For some reason the .NET RC1 install and the preview version before that are corrupt (missing files). The suggestion to uninstall and install manually from Add/Remove Programs is bogus, as this can only be done through VS 2022 setup, because the SDK was part of the latest VS 2022 upgrade.
Solution is to download the .zip archive of .NET 6 RC and replace the folders in C:\Program Files\dotnet\sdk-manifests\6.0.100\ with fresh copies.
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Removing the preview version of .net 6 from teh Add/Remove programs, and then downloading and installing the RC1 version from https://dotnet.microsoft.com/download/dotnet/6.0 created the missing files and got things working for me again.
Nope, cannot be uninstalled that way, as it was installed as part of VS 2022. See my answer for a solution that works.
I installed the .NET 6 RC1 SDK and created a new project. Then loaded my older project and it seems to be working now. I don't if installing .NET 6 SDK is required from my .NET 5 project to work in the new VS2022.