Gym: 'module could not be found' when running gym.make for atari environment.

[razzzu]

I solved this issue check the 3rd comment

when I run

gym.make('SpaceInvaders-v0')

I get the following TraceBack

OSError                                   Traceback (most recent call last)
<ipython-input-7-bd3516c22348> in <module>
----> 1 env = gym.make('SpaceInvaders-v0')

~\Anaconda3\lib\site-packages\gym\envs\registration.py in make(id, **kwargs)
    154 
    155 def make(id, **kwargs):
--> 156     return registry.make(id, **kwargs)
    157 
    158 def spec(id):

~\Anaconda3\lib\site-packages\gym\envs\registration.py in make(self, path, **kwargs)
     99             logger.info('Making new env: %s', path)
    100         spec = self.spec(path)
--> 101         env = spec.make(**kwargs)
    102         # We used to have people override _reset/_step rather than
    103         # reset/step. Set _gym_disable_underscore_compat = True on

~\Anaconda3\lib\site-packages\gym\envs\registration.py in make(self, **kwargs)
     70             env = self.entry_point(**_kwargs)
     71         else:
---> 72             cls = load(self.entry_point)
     73             env = cls(**_kwargs)
     74 

~\Anaconda3\lib\site-packages\gym\envs\registration.py in load(name)
     15 def load(name):
     16     mod_name, attr_name = name.split(":")
---> 17     mod = importlib.import_module(mod_name)
     18     fn = getattr(mod, attr_name)
     19     return fn

~\Anaconda3\lib\importlib\__init__.py in import_module(name, package)
    125                 break
    126             level += 1
--> 127     return _bootstrap._gcd_import(name[level:], package, level)
    128 
    129 

~\Anaconda3\lib\importlib\_bootstrap.py in _gcd_import(name, package, level)

~\Anaconda3\lib\importlib\_bootstrap.py in _find_and_load(name, import_)

~\Anaconda3\lib\importlib\_bootstrap.py in _find_and_load_unlocked(name, import_)

~\Anaconda3\lib\importlib\_bootstrap.py in _load_unlocked(spec)

~\Anaconda3\lib\importlib\_bootstrap_external.py in exec_module(self, module)

~\Anaconda3\lib\importlib\_bootstrap.py in _call_with_frames_removed(f, *args, **kwds)

~\Anaconda3\lib\site-packages\gym\envs\atari\__init__.py in <module>
----> 1 from gym.envs.atari.atari_env import AtariEnv

~\Anaconda3\lib\site-packages\gym\envs\atari\atari_env.py in <module>
      7 
      8 try:
----> 9     import atari_py
     10 except ImportError as e:
     11     raise error.DependencyNotInstalled(

~\Anaconda3\lib\site-packages\atari_py\__init__.py in <module>
----> 1 from .ale_python_interface import *
      2 import os
      3 
      4 def _game_dir():
      5     return os.path.join(os.path.abspath(os.path.dirname(__file__)), "atari_roms")

~\Anaconda3\lib\site-packages\atari_py\ale_python_interface.py in <module>
     16 else:
     17     ale_lib = cdll.LoadLibrary(os.path.join(os.path.dirname(__file__),
---> 18                                             'ale_interface/ale_c.dll'))
     19 
     20 ale_lib.ALE_new.argtypes = None

~\Anaconda3\lib\ctypes\__init__.py in LoadLibrary(self, name)
    432 
    433     def LoadLibrary(self, name):
--> 434         return self._dlltype(name)
    435 
    436 cdll = LibraryLoader(CDLL)

~\Anaconda3\lib\ctypes\__init__.py in __init__(self, name, mode, handle, use_errno, use_last_error)
    354 
    355         if handle is None:
--> 356             self._handle = _dlopen(self._name, mode)
    357         else:
    358             self._handle = handle

OSError: [WinError 126] The specified module could not be found

I Think i am missing a dependency or some file but i cannot figure out which it is. I have 'cmake' and i have installed the gym[atari] dependency. I can run the CartPole enviorment without any issues but cannot run any atari environments.

Requirement already satisfied: gym[atari] in c:\users\swifty\anaconda3\lib\site-packages (0.15.3) Requirement already satisfied: pyglet<=1.3.2,>=1.2.0 in c:\users\swifty\anaconda3\lib\site-packages (from gym[atari]) (1.3.2) Requirement already satisfied: six in c:\users\swifty\anaconda3\lib\site-packages (from gym[atari]) (1.12.0) Requirement already satisfied: numpy>=1.10.4 in c:\users\swifty\anaconda3\lib\site-packages (from gym[atari]) (1.16.4) Requirement already satisfied: cloudpickle~=1.2.0 in c:\users\swifty\anaconda3\lib\site-packages (from gym[atari]) (1.2.1) Requirement already satisfied: scipy in c:\users\swifty\anaconda3\lib\site-packages (from gym[atari]) (1.2.1) Requirement already satisfied: opencv-python; extra == "atari" in c:\users\swifty\anaconda3\lib\site-packages (from gym[atari]) (4.1.1.26) Requirement already satisfied: atari-py~=0.2.0; extra == "atari" in c:\users\swifty\anaconda3\lib\site-packages (from gym[atari]) (0.2.6) Requirement already satisfied: Pillow; extra == "atari" in c:\users\swifty\anaconda3\lib\site-packages (from gym[atari]) (6.1.0) Requirement already satisfied: future in c:\users\swifty\anaconda3\lib\site-packages (from pyglet<=1.3.2,>=1.2.0->gym[atari]) (0.17.1)

P.S. This is my first time posting on github so i am sorry if i am doing something wrong.

[christopherhesse]

This looks like atari-py is somehow installed incorrectly. We don't officially support the windows binaries, but you can try uninstalling and reinstalling atari-py (make sure you're on windows 10).

If you can't run python -c 'import atari_py; print(atari_py.list_games())' then it's likely things are broken and you won't be able to make that environment.

[Rong-Tao]

same problem. The ale_c.dll file is missing. And I checked the folder, it is indeed missing in the folder. which is specified the import. could you please provide the dll file?

[razzzu]

I solved this problem.

1. Uninstall gym and atari-py (If already installed):
   pip uninstall atari-py
pip uninstall gym[atari]

2. Download VS build tools here: https://visualstudio.microsoft.com/thank-you-downloading-visual-studio/?sku=BuildTools&rel=16

3. Run the VS build setup and select "C++ build tools" and install it.
   

4. Restart PC.

5. Install cmake, atari-py and gym
   pip install cmake
pip install atari-py
pip install gym[atari]

6. Now run the following code:
   import atari_py
print(atari_py.list_games())

and if everything worked then it should return a list of all games as shown below

['adventure', 'air_raid', 'alien', 'amidar', 'assault', 'asterix', 'asteroids', 'atlantis', 'bank_heist', 'battle_zone', 'beam_rider', 'berzerk', 'bowling', 'boxing', 'breakout', 'carnival', 'centipede', 'chopper_command', 'crazy_climber', 'defender', 'demon_attack', 'double_dunk', 'elevator_action', 'enduro', 'fishing_derby', 'freeway', 'frostbite', 'gopher', 'gravitar', 'hero', 'ice_hockey', 'jamesbond', 'journey_escape', 'kaboom', 'kangaroo', 'krull', 'kung_fu_master', 'montezuma_revenge', 'ms_pacman', 'name_this_game', 'phoenix', 'pitfall', 'pong', 'pooyan', 'private_eye', 'qbert', 'riverraid', 'road_runner', 'robotank', 'seaquest', 'skiing', 'solaris', 'space_invaders', 'star_gunner', 'tennis', 'time_pilot', 'tutankham', 'up_n_down', 'venture', 'video_pinball', 'wizard_of_wor', 'yars_revenge', 'zaxxon']

[JUZI1]

oooo you are so cool !!

[bode135]

Thank u !!!! very cool!!!!!!!!!!!

[chenranhuang]

cool! Thank you very much!

[delphinidae32]

it worked!! thank you so much :D

[Arjunsekar]

thank you

[tylerhnothing]

Dude thank you so much for posting the steps you took to fix this. This worked perfectly and I'm so excited to play with this.

[MoeinR69]

thank you so much

[weiguowilliam]

thank u!

[Ze1598]

Thanks @razzzu got it working by following your instructions

[imdeep2905]

If anyone is facing issue like ...ale_c.dll' (or one of its dependencies). Try using the full path with constructor syntax. and can't fix with the steps described in the comment above, checkout this.

[sparshgarg23]

imdeep 2905,thanks for the suggestion,I was facing the same issue.
On a sidenote,it would be better if OpenAI could make sure their relase was stable and interoperable on all platforms.

[WesleyQsian]

thank u so much~ it works perfectly well!