Failed to find a valid digest in the 'integrity' attribute for resource in Blazor app

I have a Blazor client/server app that I have been working on for a period and it has been working fine up to now. I suddenly started getting this error

Failed to find a valid digest in the 'integrity' attribute for resource 'https://mydomain.no/_framework/Faso.Blazor.SpinKit.dll' with computed SHA-256 integrity '1UEuhA1KzEN0bQcoU0m1eL4WKcCIWHhPgoXydAJnO9w='. The resource has been blocked.

I have tried to clean and rebuild. I have tried to add Cors, set folder permission, and many other suggested solutions, but to no avail. I am using web deploy in VS 2022 and Win Server 2016, .net core 5.0.

This is an annoying issue indeed and I'm getting that error every now and then. It seems to happen after updating some packages, and the build processes fails to pick up the new SHA for the package.

You can verify that this is the issue by finding the file containing the SHAs and compare the SHA for the dll in question with the SHA from the error message. This file is called blazor.boot.json and is generated deep inside the obj-folder of your project folder. (mine was here: obj\Release\net6.0\win-x86\PubTmp\Out\wwwroot\_framework)

If was the issue, please try this:

1. Close VS.
2. Delete the obj and bin folders from all your projects. (the web project might be enough, but hey - can't hurt)
3. Start VS
4. Rebuild solution.
5. Try Publish again.