UR5 use moveit interface to move robot

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Hi, I would like to move the UR5 Robot with the move_group python interface. I used the interface with the pr2 Robot and it's working fine. Here is the interface Tutorial page: http://docs.ros.org/hydro/api/pr2_mov...

When i would like to use the python interface with the UR5 then I do it like this:

roslaunch ur5_moveit_config demo.launch
python move_group_python_interface_tutorial.py

The robot is loading in RVIZ perfectly. When it starts the interface it's looking like this:

============ Starting tutorial setup
[ INFO] [1421497007.277703461]: Loading robot model 'ur5'...
[ INFO] [1421497007.277819143]: No root joint specified. Assuming fixed joint
[ INFO] [1421497007.716290571]: Loading robot model 'ur5'...
[ INFO] [1421497007.716347402]: No root joint specified. Assuming fixed joint
[FATAL] [1421497007.980622919]: Group 'left_arm' was not found.
Traceback (most recent call last):
  File "move_group_python_interface_tutorial.py", line 238, in <module>
    move_group_python_interface_tutorial()
  File "move_group_python_interface_tutorial.py", line 76, in move_group_python_interface_tutorial
    group = moveit_commander.MoveGroupCommander("left_arm")
  File "/opt/ros/hydro/lib/python2.7/dist-packages/moveit_commander/move_group.py", line 51, in __init__
    self._g = _moveit_move_group_interface.MoveGroup(name, "robot_description")
RuntimeError: Group 'left_arm' was not found.

Of course, i know that i haven't got a left arm on the ur5. But what else i have write in there? Or is there any better idea how to move the robot with moveit?

Thank you very much for your help =)