Module not found, dependency out of date I assume?

[CopyNinja1999]

(RLmaze) E:\OneDrive - University of Southampton\Reinforcement Learning>python BU.py
Traceback (most recent call last):
File "BU.py", line 9, in
env = gym.make("Maze-Img-50x50-POMDPMaze-v0")
File "C:\Users\123\anaconda3\envs\RLmaze\lib\site-packages\gym\envs\registration.py", line 676, in make
return registry.make(id, **kwargs)
File "C:\Users\123\anaconda3\envs\RLmaze\lib\site-packages\gym\envs\registration.py", line 490, in make
versions = self.env_specs.versions(namespace, name)
File "C:\Users\123\anaconda3\envs\RLmaze\lib\site-packages\gym\envs\registration.py", line 220, in versions
self._assert_name_exists(namespace, name)
File "C:\Users\123\anaconda3\envs\RLmaze\lib\site-packages\gym\envs\registration.py", line 297, in _assert_name_exists
raise error.NameNotFound(message)
gym.error.NameNotFound: Environment Maze-Img-50x50-POMDPMaze doesn't exist. Did you mean: Maze-50x50-POMDPMaze?