from google.protobuf.internal import builder as _builder.ImportError: cannot import name 'builder'

[reynerliu]

I followed the instructions in INSTALL and I created a env based on python=3.6,when I want to train in KITTI,the error happened. I searched on google and they told me that only the later version of protobuf covers module 'builder',and it needs at least python=3.8. Should I re-install all env?