Error when rendering

[ShaniGam]

Adding env.render() causes the error:
Traceback (most recent call last):
...
File "/home/shani/anaconda2/lib/python2.7/site-packages/pyglet/gl/glx_info.py", line 89, in have_version client = [int(i) for i in client_version.split('.')]
ValueError: invalid literal for int() with base 10: 'None'

Tried to run it in a different python file and it worked. Is there supposed to be a problem rendering while using pytorch?