Exception occured in `ProgressCallback`

[abdulsam]

I'm trying to run this file by using google colab.

I followed all the steps, and run the file using the following command: !python /content/train.py

I'm getting the following error

Traceback (most recent call last): File "/content/train.py", line 124, in train(args) File "/content/train.py", line 100, in train learn.fit_one_cycle(config.epochs, config.lr, cbs=cbs) File "/usr/local/lib/python3.10/dist-packages/fastai/callback/schedule.py", line 119, in fit_one_cycle self.fit(n_epoch, cbs=ParamScheduler(scheds)+L(cbs), reset_opt=reset_opt, wd=wd, start_epoch=start_epoch) File "/usr/local/lib/python3.10/dist-packages/fastai/learner.py", line 264, in fit self._with_events(self._do_fit, 'fit', CancelFitException, self._end_cleanup) File "/usr/local/lib/python3.10/dist-packages/fastai/learner.py", line 199, in with_events try: self(f'before{event_type}'); f() File "/usr/local/lib/python3.10/dist-packages/fastai/learner.py", line 253, in _do_fit self._with_events(self._do_epoch, 'epoch', CancelEpochException) File "/usr/local/lib/python3.10/dist-packages/fastai/learner.py", line 199, in with_events try: self(f'before{event_type}'); f() File "/usr/local/lib/python3.10/dist-packages/fastai/learner.py", line 247, in _do_epoch self._do_epoch_train() File "/usr/local/lib/python3.10/dist-packages/fastai/learner.py", line 239, in _do_epoch_train self._with_events(self.all_batches, 'train', CancelTrainException) File "/usr/local/lib/python3.10/dist-packages/fastai/learner.py", line 199, in with_events try: self(f'before{event_type}'); f() File "/usr/local/lib/python3.10/dist-packages/fastai/learner.py", line 172, in call def call(self, event_name): L(event_name).map(self._call_one) File "/usr/local/lib/python3.10/dist-packages/fastcore/foundation.py", line 156, in map def map(self, f, *args, **kwargs): return self._new(map_ex(self, f, *args, gen=False, **kwargs)) File "/usr/local/lib/python3.10/dist-packages/fastcore/basics.py", line 840, in map_ex return list(res) File "/usr/local/lib/python3.10/dist-packages/fastcore/basics.py", line 825, in call return self.func(*fargs, **kwargs) File "/usr/local/lib/python3.10/dist-packages/fastai/learner.py", line 176, in _call_one for cb in self.cbs.sorted('order'): cb(event_name) File "/usr/local/lib/python3.10/dist-packages/fastai/callback/core.py", line 62, in call except Exception as e: raise modify_exception(e, f'Exception occured in {self.__class__.__name__} when calling event {event_name}:\n\t{e.args[0]}', replace=True) File "/usr/local/lib/python3.10/dist-packages/fastai/callback/core.py", line 60, in call try: res = getcallable(self, event_name)() File "/usr/local/lib/python3.10/dist-packages/fastai/callback/progress.py", line 27, in before_train def before_train(self): self._launch_pbar() File "/usr/local/lib/python3.10/dist-packages/fastai/callback/progress.py", line 37, in _launch_pbar self.pbar.update(0) File "/usr/local/lib/python3.10/dist-packages/fastprogress/fastprogress.py", line 59, in update self.update_bar(0) File "/usr/local/lib/python3.10/dist-packages/fastprogress/fastprogress.py", line 81, in update_bar self.on_update(val, f'{pct}[{val}/{tot} {elapsed_t}{self.lt}{remaining_t}{end}]') File "/usr/local/lib/python3.10/dist-packages/fastprogress/fastprogress.py", line 134, in on_update elif self.parent is not None: self.parent.show() File "/usr/local/lib/python3.10/dist-packages/fastprogress/fastprogress.py", line 177, in show self.out.update(HTML(self.html_code)) AttributeError: Exception occured in ProgressCallback when calling event before_train: 'NoneType' object has no attribute 'update'

Please help me to resolve this error.