actionlib error

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Hello, I'm new to ROS and am having problems with the actionlib tutorials. After making the directory ./action/move_arm.action with this as the action file;

#goal definition
int32 goalState
---
#result definition
int32[] resultState
---
#feedback definition
int32[] feedbackState

attempting to generate the appropriate files using the command line prompt

$ rosrun actionlib_msgs genaction.py . move_arm.action

I get the following traceback error:

Traceback (most recent call last):
  File "/opt/ros/fuerte/share/actionlib_msgs/scripts/genaction.py", line 133, in <module>
    if __name__ == '__main__': main()
  File "/opt/ros/fuerte/share/actionlib_msgs/scripts/genaction.py", line 72, in main
    os.makedirs(output_dir)
  File "/usr/lib/python2.7/os.py", line 145, in makedirs
    head, tail = path.split(name)
  File "/usr/lib/python2.7/posixpath.py", line 83, in split
    i = p.rfind('/') + 1
AttributeError: 'NoneType' object has no attribute 'rfind'

Is this a python problem? Should it be updated somehow?

Thanks