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There are several similar questions but no one of them actually works for me.
I wanted to make a .Net Core application (API) but as I said the build fails (even with the default application). If I try to continue, IIS shows "Error 500.0 - ANCM In-Process Handler Load Failure". Tried everything, from restarting VS to deleting and reinstalling it but it does not work. It instead works on a virtual machine but have no idea what's the difference. What might I do?

Microsoft Visual Studio Community 2019 Version 16.8.3

AlessandroF
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  • Does this answer your question? [How to fix error "ANCM In-Process Handler Load Failure"?](https://stackoverflow.com/questions/55939860/how-to-fix-error-ancm-in-process-handler-load-failure) – Ken Y-N Dec 14 '20 at 23:15
  • [Windows error register] Application: MSBuild.exe framework version: v4.0.30319 Description: process terminated due to an unhandled exception Exception: System.IO.FileLoadException in System.SpanHelpers.IndexOf(Char ByRef, Char, Int32) in System.MemoryExtensions.IndexOf[[System.Char, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]](System.ReadOnlySpan`1, Char) ... and many other lines – AlessandroF Dec 14 '20 at 23:17
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    @ken-y-n yes I saw that but nope, it does not work – AlessandroF Dec 14 '20 at 23:17

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I've the same error but in an ASPNET u need see the errors in the build/debugging output

I've an error but that don't show

You need to find the error within the logs

My error was an update Panel

//// EDIT: Try this: Select Entire Solution and Build Only to show the Errors

Crihstian Molina
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