This note serves as a collection of fixes for errors which may occur on the Windows platform.
If during installation you get errors regarding missing files or unspecified paths,
followed by a long path string, you might be limited by the MAX_PATH
setting on
windows. Try removing this limitation with these instructions.
RuntimeError:
An attempt has been made to start a new process before the
current process has finished its bootstrapping phase.
This probably means that you are not using fork to start your
child processes and you have forgotten to use the proper idiom
in the main module:
if __name__ == '__main__':
freeze_support()
...
The "freeze_support()" line can be omitted if the program
is not going to be frozen to produce an executable.
The implementation of multiprocessing
is different on Windows, which
uses spawn
instead of fork
. So we have to wrap the code with an
if-clause to protect the code from executing multiple times. Refactor
your code into the following structure.
import minerl
import gym
def main()
# do your main minerl code
env = gym.make('MineRLTreechop-v0')
if __name__ == '__main__':
main()