ImportError: cannot import name 'csrc' from 'nerfacc'

[wzj344]

Hello.
I have been trying to train a custom model using mlp_nerf, but encountered this error:
ImportError: cannot import name 'csrc' from 'nerfacc'
Put a breakpoint at the line of code where the error occurred. I found that running the train_mlp_nerf.py file you provided does not pass the breakpoint and does not jump inboard when executing the estimator.sampling function. However, it does jump when training my model and the above error occurs.
What might be the cause of this? Thank you very much for any Pointers!