Runtime error from multiprocessing

[weatherley]

When running this on a windows 10 machine in pycharm, there is an infinite loop of runtime errors caused by line 427 in lppls.py:

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.

Any solutions to this would be very helpful.