Sounds like you're not pointing to the correct location. That was happening to me until I discovered the directory level GC was expecting.
I have an environment setup for my GC python installation (I recommend you do the same btw, but anyway)
I point GC to here:
~/miniconda3/envs/<myenv>
<myenv> contains the /bin, etc/ lib/ directories for the py installation. That's the directory level you need to point GC to.
Hope it helps
- Rob