python3.6.2+Django2.0.3  提示错误，但运行命令又能正常使用，求教bobby老师这个错误提示是什么意思呢？

Failed to get real commands on module "onlineEdu": python process died with code 1: Traceback (most recent call last):
  File "I:\soft\pycharm20170105\PyCharm 2017.1.5\helpers\pycharm\_jb_manage_tasks_provider.py", line 28, in <module>
    parser.report_data(dumper, commands_to_skip)
  File "I:\soft\pycharm20170105\PyCharm 2017.1.5\helpers\pycharm\django_manage_commands_provider\_parser\parser.py", line 90, in report_data
    module_to_use.process_command(dumper, command, parser)
  File "I:\soft\pycharm20170105\PyCharm 2017.1.5\helpers\pycharm\django_manage_commands_provider\_parser\_argparse.py", line 43, in process_command
    argument_info = (1, _utils.get_opt_type(action))
  File "I:\soft\pycharm20170105\PyCharm 2017.1.5\helpers\pycharm\django_manage_commands_provider\_parser\_utils.py", line 20, in get_opt_type
    assert isinstance(opt.choices, list), "Choices should be list"
AssertionError: Choices should be list