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.