What does “Cannot evaluate expression because the code of the current method is optimized.” mean?

Question

I wrote some code with a lot of recursion, that takes quite a bit of time to complete. Whenever I \"pause\" the run to look at what\'s going on I get:

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Answer 1

In my case I had 2 projects in my solution and was running a project that was not the startup project. When I changed it to startup project the debugging started to work again.

Hope it helps someone.