InvalidProgramException / Common Language Runtime detected an invalid program

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Just wanted to add my experience for this…
In my case, I am hosting my C# Web API on Azure and I encountered this message when trying to log in to my API.
I had to go into my Azure management portal (portal.azure.com), go to App Services, choose my Web API program and click Restart from the Overview screen.
After this, the program worked as normal again.
Did not find any further clues in my logs.

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