ImportError: cannot import name 'specs' from 'dm_control.rl'

[wxplovehlt]

hi，when I execute the following test code，will report the following error. Looking forward to your reply
import gym
import dm_control2gym

make the dm_control environment

env = dm_control2gym.make(domain_name="cartpole", task_name="balance")

/env/lib/python3.7/site-packages/glfw/init.py:906: GLFWError: (65544) b'X11: Failed to open display :0'
warnings.warn(message, GLFWError)
Traceback (most recent call last):
File "test-dm2gym.py", line 2, in
import dm_control2gym
File "/env/lib/python3.7/site-packages/dm_control2gym-0.0.4-py3.7.egg/dm_control2gym/init.py", line 3, in
File "/env/lib/python3.7/site-packages/dm_control2gym-0.0.4-py3.7.egg/dm_control2gym/wrapper.py", line 3, in
ImportError: cannot import name 'specs' from 'dm_control.rl' (/env/lib/python3.7/site-packages/dm_control/rl/init.py)