Not working with gymnasium 1.0.0

[guiambros]

It seems gymnasium latest version introduced some breaking changes. The same code runs well without any modifications on gymnasium 0.29.0, but breaks on gymnasium 1.0.0:

Traceback (most recent call last):
  File ".../test-simplegrid.py", line 10, in <module>
    obs, info = env.reset()
  File ".../lib/python3.10/site-packages/gymnasium/wrappers/common.py", line 146, in reset
    return super().reset(seed=seed, options=options)
  File ".../lib/python3.10/site-packages/gymnasium/core.py", line 328, in reset
    return self.env.reset(seed=seed, options=options)
  File ".../lib/python3.10/site-packages/gymnasium/wrappers/common.py", line 400, in reset
    return super().reset(seed=seed, options=options)
  File ".../lib/python3.10/site-packages/gymnasium/core.py", line 328, in reset
    return self.env.reset(seed=seed, options=options)
  File ".../lib/python3.10/site-packages/gymnasium/wrappers/common.py", line 293, in reset
    return env_reset_passive_checker(self.env, seed=seed, options=options)
  File ".../lib/python3.10/site-packages/gymnasium/utils/passive_env_checker.py", line 185, in env_reset_passive_checker
    result = env.reset(**kwargs)
  File ".../lib/python3.10/site-packages/gym_simplegrid/envs/simple_grid.py", line 102, in reset
    self.start_xy = self.parse_state_option('start_loc', options)
  File ".../lib/python3.10/site-packages/gym_simplegrid/envs/simple_grid.py", line 184, in parse_state_option
    state = options[state_name]
TypeError: 'NoneType' object is not subscriptable

[damat-le]

The migration guide to v1.0.0 for Gymnasium is not updated yet, thus I'm not sure what can have caused the disruption. I also tried to reproduce your problem by running some pieces of code on both versions of gymnasium but I didn't have any issue. Can you provide more information please?