Only Stable-Baselines3 2.x supports Gymnasium. As SB3 2.x is currently in beta, you will need to specify pip install "stable_baselines3[extra]>=2.0.0a9" explicitly, or install the master version

glPushMatrix something error: Version change of pyglet: pip install pyglet==1.5.27

use duration instead of fpsfps=50 == duration=20, 1000/50=20 in gif.py

• observation error in check_env when using gym ! AssertionError: The observation returned by the reset() method should be a single value, not a tuple
• With gymaniusm its fine, no error

rl_zoo3 with gymansium ??