Failed on " HopperEnv' object has no attribute 'seed' "

[HughesField]

Traceback (most recent call last):
File "/home/zjt/exp/PyTorch-RL/examples/ppo_gym.py", line 70, in
env.seed(args.seed)
File "/home/zjt/anaconda3/envs/mujoco/lib/python3.9/site-packages/gym/core.py", line 241, in getattr
return getattr(self.env, name)
File "/home/zjt/anaconda3/envs/mujoco/lib/python3.9/site-packages/gym/core.py", line 241, in getattr
return getattr(self.env, name)
File "/home/zjt/anaconda3/envs/mujoco/lib/python3.9/site-packages/gym/core.py", line 241, in getattr
return getattr(self.env, name)
AttributeError: 'HopperEnv' object has no attribute 'seed'

When "python examples/ppo_gym.py --env-name Hopper-v2", the program encountered an error with env.seed(args.seed), and even after commenting out this line, it ran into another error related to 'seed': AttributeError: 'numpy.random._generator.Generator' object has no attribute 'seed'.