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Added env.env.close() in order to remove the error:
Traceback (most recent call last):
File "/home/ekele/anaconda3/envs/gpurl/lib/python3.6/site-packages/gym/envs/classic_control/rendering.py", line 143, in del
File "/home/ekele/anaconda3/envs/gpurl/lib/python3.6/site-packages/gym/envs/classic_control/rendering.py", line 62, in close
File "/home/ekele/anaconda3/envs/gpurl/lib/python3.6/site-packages/pyglet/window/xlib/init.py", line 480, in close
File "/home/ekele/anaconda3/envs/gpurl/lib/python3.6/site-packages/pyglet/gl/xlib.py", line 345, in destroy
File "/home/ekele/anaconda3/envs/gpurl/lib/python3.6/site-packages/pyglet/gl/base.py", line 334, in destroy
File "/home/ekele/anaconda3/envs/gpurl/lib/python3.6/site-packages/pyglet/gl/xlib.py", line 335, in detach
File "/home/ekele/anaconda3/envs/gpurl/lib/python3.6/site-packages/pyglet/gl/lib.py", line 97, in errcheck
ImportError: sys.meta_path is None, Python is likely shutting down