turtlebot 1.0 calibration

edit

I just updated to the most recent debs:

ii ros-electric-turtlebot 0.9.0-s1329169192~lucid
ii ros-electric-turtlebot-apps 0.9.0-s1329172196~lucid
ii ros-electric-turtlebot-robot 1.0.0-s1329209176~lucid

Now when I:

roslaunch turtlebot_calibration calibrate.launch

I get a neverending stream of errors:

[ERROR] [WallTime: 1329273192.794075] bad callback: <bound method="" scantoangle.scan_cb="" of="" <__main__.scantoangle="" instance="" at="" 0x2918200&gt;&gt;="" traceback="" (most="" recent="" call="" last):="" file="" "="" opt="" ros="" electric="" stacks="" ros_comm="" clients="" rospy="" src="" rospy="" topics.py",="" line="" 581,="" in="" _invoke_callback="" cb(msg)="" file="" "="" opt="" ros="" electric="" stacks="" turtlebot_apps="" turtlebot_calibration="" src="" turtlebot_calibration="" scan_to_angle.py",="" line="" 74,="" in="" scan_cb="" angle="atan2((-sum_x&lt;em">sum_y+numsum_xy)/(numsum_xx-sum_xsum_x), 1) ZeroDivisionError: integer division or modulo by zero

[ERROR] [WallTime: 1329273192.865006] bad callback: <bound method="" scantoangle.scan_cb="" of="" <__main__.scantoangle="" instance="" at="" 0x2918200&gt;&gt;="" traceback="" (most="" recent="" call="" last):="" file="" "="" opt="" ros="" electric="" stacks="" ros_comm="" clients="" rospy="" src="" rospy="" topics.py",="" line="" 581,="" in="" _invoke_callback="" cb(msg)="" file="" "="" opt="" ros="" electric="" stacks="" turtlebot_apps="" turtlebot_calibration="" src="" turtlebot_calibration="" scan_to_angle.py",="" line="" 74,="" in="" scan_cb="" angle="atan2((-sum_x&lt;em">sum_y+numsum_xy)/(numsum_xx-sum_xsum_x), 1) ZeroDivisionError: integer division or modulo by zero