issue with ml version 14

after a while of training i get this message on pyhton and the unity stops

Code (CSharp):

1. Traceback (most recent call last):
2.   File "d:\python\python37\lib\site-packages\mlagents\trainers\trainer_controller.py", line 175, in start_learning
3.     n_steps = self.advance(env_manager)
4.   File "d:\python\python37\lib\site-packages\mlagents_envs\timers.py", line 305, in wrapped
5.     return func(*args, **kwargs)
6.   File "d:\python\python37\lib\site-packages\mlagents\trainers\trainer_controller.py", line 250, in advance
7.     trainer.advance()
8.   File "d:\python\python37\lib\site-packages\mlagents\trainers\ghost\trainer.py", line 243, in advance
9.     self.trainer.advance()
10.   File "d:\python\python37\lib\site-packages\mlagents\trainers\trainer\rl_trainer.py", line 274, in advance
11.     self._process_trajectory(t)
12.   File "d:\python\python37\lib\site-packages\mlagents\trainers\ppo\trainer.py", line 67, in _process_trajectory
13.     super()._process_trajectory(trajectory)
14.   File "d:\python\python37\lib\site-packages\mlagents\trainers\trainer\rl_trainer.py", line 232, in _process_trajectory
15.     self._maybe_save_model(self.get_step + len(trajectory.steps))
16.   File "d:\python\python37\lib\site-packages\mlagents\trainers\trainer\rl_trainer.py", line 257, in _maybe_save_model
17.     self._checkpoint()
18.   File "d:\python\python37\lib\site-packages\mlagents_envs\timers.py", line 305, in wrapped
19.     return func(*args, **kwargs)
20.   File "d:\python\python37\lib\site-packages\mlagents\trainers\trainer\rl_trainer.py", line 155, in _checkpoint
21.     checkpoint_path = self.model_saver.save_checkpoint(self.brain_name, self.step)
22.   File "d:\python\python37\lib\site-packages\mlagents\trainers\model_saver\torch_model_saver.py", line 56, in save_checkpoint
23.     torch.save(state_dict, os.path.join(self.model_path, "checkpoint.pt"))
24.   File "d:\python\python37\lib\site-packages\torch\serialization.py", line 369, in save
25.     with _open_file_like(f, 'wb') as opened_file:
26.   File "d:\python\python37\lib\site-packages\torch\serialization.py", line 230, in _open_file_like
27.     return _open_file(name_or_buffer, mode)
28.   File "d:\python\python37\lib\site-packages\torch\serialization.py", line 211, in __init__
29.     super(_open_file, self).__init__(open(name, mode))
30. OSError: [Errno 22] Invalid argument: 'results\\one\\Balance\\checkpoint.pt'
31.  
32. During handling of the above exception, another exception occurred:
33.  
34. Traceback (most recent call last):
35.   File "d:\python\python37\lib\runpy.py", line 193, in _run_module_as_main
36.     "__main__", mod_spec)
37.   File "d:\python\python37\lib\runpy.py", line 85, in _run_code
38.     exec(code, run_globals)
39.   File "D:\Python\Python37\Scripts\mlagents-learn.exe\__main__.py", line 7, in <module>
40.   File "d:\python\python37\lib\site-packages\mlagents\trainers\learn.py", line 250, in main
41.     run_cli(parse_command_line())
42.   File "d:\python\python37\lib\site-packages\mlagents\trainers\learn.py", line 246, in run_cli
43.     run_training(run_seed, options)
44.   File "d:\python\python37\lib\site-packages\mlagents\trainers\learn.py", line 125, in run_training
45.     tc.start_learning(env_manager)
46.   File "d:\python\python37\lib\site-packages\mlagents_envs\timers.py", line 305, in wrapped
47.     return func(*args, **kwargs)
48.   File "d:\python\python37\lib\site-packages\mlagents\trainers\trainer_controller.py", line 200, in start_learning
49.     self._save_models()
50.   File "d:\python\python37\lib\site-packages\mlagents_envs\timers.py", line 305, in wrapped
51.     return func(*args, **kwargs)
52.   File "d:\python\python37\lib\site-packages\mlagents\trainers\trainer_controller.py", line 80, in _save_models
53.     self.trainers[brain_name].save_model()
54.   File "d:\python\python37\lib\site-packages\mlagents\trainers\ghost\trainer.py", line 320, in save_model
55.     self.trainer.save_model()
56.   File "d:\python\python37\lib\site-packages\mlagents\trainers\trainer\rl_trainer.py", line 181, in save_model
57.     model_checkpoint = self._checkpoint()
58.   File "d:\python\python37\lib\site-packages\mlagents_envs\timers.py", line 305, in wrapped
59.     return func(*args, **kwargs)
60.   File "d:\python\python37\lib\site-packages\mlagents\trainers\trainer\rl_trainer.py", line 155, in _checkpoint
61.     checkpoint_path = self.model_saver.save_checkpoint(self.brain_name, self.step)
62.   File "d:\python\python37\lib\site-packages\mlagents\trainers\model_saver\torch_model_saver.py", line 56, in save_checkpoint
63.     torch.save(state_dict, os.path.join(self.model_path, "checkpoint.pt"))
64.   File "d:\python\python37\lib\site-packages\torch\serialization.py", line 369, in save
65.     with _open_file_like(f, 'wb') as opened_file:
66.   File "d:\python\python37\lib\site-packages\torch\serialization.py", line 230, in _open_file_like
67.     return _open_file(name_or_buffer, mode)
68.   File "d:\python\python37\lib\site-packages\torch\serialization.py", line 211, in __init__
69.     super(_open_file, self).__init__(open(name, mode))
70. OSError: [Errno 22] Invalid argument: 'results\\one\\Balance\\checkpoint.pt'

 

i adjusted rewards so i dont get big negatives and it didnt reproduced since, not sure if related or just random thing that caused the crash.