AttributeError: module 'em' has no attribute 'RAW_OPT'

[ccw1003]

when I catkin build this ros package, I met the error:
AttributeError: module 'em' has no attribute 'RAW_OPT';
Does anyone know how to deal with this problem?Or anyone met this error before?
I will be very grateful if anyone can help me.

[standmit]

solution:
https://stackoverflow.com/a/77656642

[kamronkhakimov]

I solved it by:
pip install empy=3.3.4

[covelus]

I think I probably accidentally updated all packages, and broke it again, as new empy packages (4.1) miss that RAW_OPT attribute.
I got the error "This environment is externally managed", and I fixed it through:
pip3 uninstall empy --break-system-packages
pip3 install empy==3.3.4 --break-system-packages

[priya050898]

problem is not resolved using pip install empy=3.3.4
problem still exist