"mtppo_metaworld_mt1_push" example problem

[YujinK-CHN]

Hi, when I'm trying to run the example to train PPO on ML1 Push enironment (the provide code), "ValueError: GymEnv can take env as either a string, or an Gym environment, but got type <class 'metaworld.envs.mujoco.sawyer_xyz.v2.sawyer_push_v2.SawyerPushEnvV2'> instead." jump out. Caused by "envs = [env_up() for env_up in train_task_sampler.sample(n_tasks)]"