Garage mujoco import error

[SapanaChaudhary]

Hi,

On running the halfcheetah code, I get the following error:

Traceback (most recent call last):
  File "./transformer_ppo_halfcheetah.py", line 10, in <module>
    from garage.envs.mujoco.half_cheetah_vel_env import HalfCheetahVelEnv
  File "../anaconda3/envs/transformer-metarl/lib/python3.7/site-packages/garage/envs/mujoco/__init__.py", line 9, in <module>
    from garage.envs.mujoco.ant_dir import AntDirEnv
  File "../anaconda3/envs/transformer-metarl/lib/python3.7/site-packages/garage/envs/mujoco/ant_dir.py", line 5, in <module>
    from garage.envs.mujoco.ant import AntEnv
  File "../anaconda3/envs/transformer-metarl/lib/python3.7/site-packages/garage/envs/mujoco/ant.py", line 3, in <module>
    from .mujoco_env import MujocoEnv
  File "../anaconda3/envs/transformer-metarl/lib/python3.7/site-packages/garage/envs/mujoco/mujoco_env.py", line 8, in <module>
    from garage.envs.mujoco.core.serializable import Serializable
ModuleNotFoundError: No module named 'garage.envs.mujoco.core'

Could you please let me know if you have come across this and how you fixed it. Thanks!