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I don't understand where the f*** 9.2.7 is coming from.
This error is killing me!

@Amirography This usually happens when your compiler on your machine was updated but the compiled binary for ghcide was compiled with a different version. Are you using nix for both ghcide and ghc? Are you using stack?

@downtofunctional yes yes and yes.
Apparently I had to change the stack.yaml from 20.18 to 20.25.