ImportError: No module named actions.fetcher 怎么解决？ （python菜鸟）

[mingyitianxia]

[root@laoyang tour]# python demobasic.py
load logging configure from /usr/local/lib/python2.7/site-packages/pyrailgun/modules/logging.conf
2016-09-07 11:11:41,996 : vc cartoon is now running
Traceback (most recent call last):
File "demobasic.py", line 16, in
railgun.fire();
File "/usr/local/lib/python2.7/site-packages/pyrailgun/railgun.py", line 40, in fire
self.parser_shells(self.task_data, shell_groups)
File "/usr/local/lib/python2.7/site-packages/pyrailgun/railgun.py", line 103, in __parser_shells
self.__parser_shells(subtask, shell_groups)
File "/usr/local/lib/python2.7/site-packages/pyrailgun/railgun.py", line 81, in __parser_shells
module = __import("pyrailgun.actions." + action_name)
ImportError: No module named actions.fetcher