what is the gym version

[Usaywook]

What is your gym version to implement your code? If I called env.unwrapped.restore_state function

I got terminate called after throwing an instance of 'char const*'
Aborted (core dumped)

This is because your checkpoint size is (1009,). My gym version is 0.15.4 tensorflow == 1.12.0 python == 3.6.9 When I called env.unwrapped.clone_state() function I got (1017,) size so

chpt = env.unwrapped.clone_state()
env.unwrapped.restore_state(chpt)

works vell, but your .demo file does not work well. I need your feedback as soon as possible.