It’s a guess, but maybe your swap is too small and therefore the operation cannot be performed?
As far as I know these are paging errors, but I haven’t used Windows in a while so maybe I’m completely on the wrong path.
Another possibility might be just a strange error message caused by another bug.
If you use multiprocessing, you should guard your script with
if __name__=='__main__':
    run()

Otherwise the processes will be spawned recursively.
Could one of these guesses be the reason?