Self-play - ValueError: Invalid action encountered while updating root

[SootyOwl]

Hi,

Attempting to use this as instructed (subclassing GameState) seems to work at first, but during the self-play step the console is filled with the same errors:

Exception ignored in: 'alphazero.MCTS.MCTS.update_root'
Traceback (most recent call last):
  File "/home/tyto/miniconda3/envs/torch/lib/python3.9/multiprocessing/process.py", line 315, in _bootstrap
    self.run()
ValueError: Invalid action encountered while updating root: 155
ValueError: Invalid action encountered while updating root: 91

[Bobingstern]

Make sure your env has the termination conditions set properly. Thats what usually causes this issue since it's trying to search through invalid positions.