Single GPU Training problem #8

Traceback (most recent call last):
File "/home/Prjs/ECCV22-PointMixer-main/sem_seg/train_pl.py", line 157, in
cli_main()
File "/home/Prjs/ECCV22-PointMixer-main/sem_seg/train_pl.py", line 150, in cli_main
trainer.fit(model, train_loader, val_loader)
File "/home/anaconda3/envs/pointmixer/lib/python3.9/site-packages/pytorch_lightning/trainer/trainer.py", line 738, in fit
self._call_and_handle_interrupt(
File "/home/anaconda3/envs/pointmixer/lib/python3.9/site-packages/pytorch_lightning/trainer/trainer.py", line 683, in _call_and_handle_interrupt
return trainer_fn(*args, **kwargs)
File "/home/anaconda3/envs/pointmixer/lib/python3.9/site-packages/pytorch_lightning/trainer/trainer.py", line 773, in _fit_impl
self._run(model, ckpt_path=ckpt_path)
File "/home/anaconda3/envs/pointmixer/lib/python3.9/site-packages/pytorch_lightning/trainer/trainer.py", line 1195, in _run
self._dispatch()
.
.
.
.

raise RuntimeError("Default process group has not been initialized, "
RuntimeError: Default process group has not been initialized, please make sure to call init_process_group.