"[CRITICAL] can not get the initial ghci prompt" error when trying to run debugger

[Ariel Elkin]

I have both cabal and stack installed on my system.

I followed the instructions to create a new Stack project.

$ ghci-dap --version             
[DAP][INFO] start ghci-dap-0.0.16.0.
The Glorious Glasgow Haskell Compilation System, version 8.10.4
$ haskell-debug-adapter --version                         
haskell-debug-adapter-0.0.35.0

When I click "start debugging" I get this error message:

These are the console logs:

Starting GHCi.
Wait for a moment.

CWD: /Users/arielelkin/stacker
CMD: stack ghci --with-ghc=ghci-dap --test --no-load --no-build --main-is TARGET

Now, waiting for an initial prompt("> ") from ghci.

The following GHC options are incompatible with GHCi and have not been passed to it: -threaded
Configuring GHCi with the following packages: sample
[DAP][INFO] start ghci-dap-0.0.16.0.
GHCi, version 8.10.4: https://www.haskell.org/ghc/  :? for help

<interactive>:1:1: error:
    Bad interface file: /Users/me/.stack/programs/x86_64-osx/ghc-8.10.7/lib/ghc-8.10.7/ghc-prim-0.6.1/GHC/Types.hi
        mismatched interface file versions (wanted "8104", got "8107")
2

invalid HANDLE. eof.

This could be due to a mismatch between the two ghc I have installed:

$ stack exec ghc -- --version
The Glorious Glasgow Haskell Compilation System, version 8.10.7
$ ghc --version              
The Glorious Glasgow Haskell Compilation System, version 8.10.4

Isn't the debugger supposed to use stack ghc?

[phoityne]

Hi.

Isn't the debugger supposed to use stack ghc?

No, the debugger uses the ghci-dap with the stack project environment.
Could you reinstall the ghci-dap, from your stack project folder (with ghc-8.10.7) ?

Regards.

[Ariel Elkin]

Looks like it's working now, thanks