Traceback (most recent call last):
  File "/Users/stuartkim/.pyenv/versions/3.7.7/envs/deepRL/lib/python3.7/site-packages/gym/envs/classic_control/rendering.py", line 25, in <module>
    from pyglet.gl import *
  File "/Users/stuartkim/.pyenv/versions/3.7.7/envs/deepRL/lib/python3.7/site-packages/pyglet/gl/__init__.py", line 101, in <module>
    from pyglet.gl.lib import GLException
  File "/Users/stuartkim/.pyenv/versions/3.7.7/envs/deepRL/lib/python3.7/site-packages/pyglet/gl/lib.py", line 142, in <module>
    from pyglet.gl.lib_agl import link_GL, link_GLU, link_AGL
  File "/Users/stuartkim/.pyenv/versions/3.7.7/envs/deepRL/lib/python3.7/site-packages/pyglet/gl/lib_agl.py", line 50, in <module>
    framework='/System/Library/Frameworks/OpenGL.framework')
  File "/Users/stuartkim/.pyenv/versions/3.7.7/envs/deepRL/lib/python3.7/site-packages/pyglet/lib.py", line 129, in load_library
    return self.load_framework(kwargs['framework'])
  File "/Users/stuartkim/.pyenv/versions/3.7.7/envs/deepRL/lib/python3.7/site-packages/pyglet/lib.py", line 284, in load_framework
    raise ImportError("Can't find framework %s." % path)
ImportError: Can't find framework /System/Library/Frameworks/OpenGL.framework.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/stuartkim/projects/study/reinforcementLearning/Deep-Reinforcement-Learning-Hands-On-Second-Edition/Chapter02/02_cartpole_random.py", line 13, in <module>
    env.render()
  File "/Users/stuartkim/.pyenv/versions/3.7.7/envs/deepRL/lib/python3.7/site-packages/gym/core.py", line 240, in render
    return self.env.render(mode, **kwargs)
  File "/Users/stuartkim/.pyenv/versions/3.7.7/envs/deepRL/lib/python3.7/site-packages/gym/envs/classic_control/cartpole.py", line 174, in render
    from gym.envs.classic_control import rendering
  File "/Users/stuartkim/.pyenv/versions/3.7.7/envs/deepRL/lib/python3.7/site-packages/gym/envs/classic_control/rendering.py", line 32, in <module>
    ''')
ImportError: 
    Error occurred while running `from pyglet.gl import *`
    HINT: make sure you have OpenGL install. On Ubuntu, you can run 'apt-get install python-opengl'.
    If you're running on a server, you may need a virtual frame buffer; something like this should work:
    'xvfb-run -s "-screen 0 1400x900x24" python <your_script.py>'