Error while installing or-gym

[QJZJ12]

!pip install or-gym

Collecting or-gym
Using cached or_gym-0.5.0-py3-none-any.whl (39 kB)
Collecting gym<=0.19.0 (from or-gym)
Using cached gym-0.19.0.tar.gz (1.6 MB)
error: subprocess-exited-with-error

× python setup.py egg_info did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.
Preparing metadata (setup.py) ... error
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.