Problem running the simple agent notebook

[bugtig]

I received the following error while running the simple neural agent in the notebook:

Traceback (most recent call last):
  File "debug.py", line 71, in <module>
    train_agent(agent, "obj_10_qlen_3_room_2/*ulx")
  File "debug.py", line 50, in train_agent
    game_state, reward, done = env.step(command)
  File "/home/anaconda3/envs/textworld/lib/python3.6/site-packages/textworld/envs/glulx/git_glulx_ml.py", line 441, in step
    self.game_state = self.game_state.update(command, output)
  File "/home/anaconda3/envs/textworld/lib/python3.6/site-packages/textworld/envs/glulx/git_glulx_ml.py", line 216, in update
    game_state._game_progression.update(game_state._action)
  File "/home/anaconda3/envs/textworld/lib/python3.6/site-packages/textworld/generator/game.py", line 624, in update
    self.quest_progression.update(action, bypass=self.winning_policy[:i])
  File "/home/anaconda3/envs/textworld/lib/python3.6/site-packages/textworld/generator/game.py", line 529, in update
    self._pop_action_from_tree(action, self._tree)
  File "/home/anaconda3/envs/textworld/lib/python3.6/site-packages/textworld/generator/game.py", line 486, in _pop_action_from_tree
    tree.pop(action)
  File "/home/anaconda3/envs/textworld/lib/python3.6/site-packages/textworld/generator/dependency_tree.py", line 109, in pop
    raise ValueError("That element is not a leaf: {!r}.".format(value))
ValueError: That element is not a leaf: Action('take/c-P-r-c-k-I', (Proposition('at', (Variable('P', 'P'), Variable('r_1', 'r'))), Proposition('at', (Variable('c_0', 'c'), Variable('r_1', 'r'))), Proposition('open', (Variable('c_0', 'c'),)), Proposition('in', (Variable('k_0', 'k'), Variable('c_0', 'c')))), (Proposition('at', (Variable('P', 'P'), Variable('r_1', 'r'))), Proposition('at', (Variable('c_0', 'c'), Variable('r_1', 'r'))), Proposition('open', (Variable('c_0', 'c'),)), Proposition('in', (Variable('k_0', 'k'), Variable('I', 'I'))))).

Any ideas what is going on?

[MarcCote]

Thanks for reporting this bug. It should be fixed with PR #30.

[MarcCote]

This issue should be fixed with #42 and #43. I'm closing it. Feel free to re-open it otherwise.