Ensure condition failed on project start

I had the same issue, and the issue was was in the “blueprint functions”.
There are about 100+ functions in my library, so I was afraid that I have to rebuild them.
I have started to copy and paste the functions to new library but suddenly one of the functions popped to the bottom for no reason, I opened it and it had the “world context” pin which was never added by me.
After removal of the pin all worked.
This is a life saver…

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