pip install not working

I think it is the 2to3 option in setup.py.
Is 2to3 still needed?

`Collecting CAI
Using cached CAI-1.0.3.tar.gz (6.0 kB)
ERROR: Command errored out with exit status 1:
command: /home/bjorn/anaconda3/envs/new39/bin/python3.9 -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-y9phjkp9/cai_8c869096cf864cb8934fa27a731d3393/setup.py'"'"'; __file__='"'"'/tmp/pip-install-y9phjkp9/cai_8c869096cf864cb8934fa27a731d3393/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-52f8wm2g
cwd: /tmp/pip-install-y9phjkp9/cai_8c869096cf864cb8934fa27a731d3393/
Complete output (1 lines):
error in CAI setup command: use_2to3 is invalid.`