xv11_driver crashes

[forrestv]

mason@mason-linaro-ubuntu-desktop:~/catkin_ws/src/IEEE2014/ros/ieee2014_localization$ rosrun xv11_driver neato_laser_publisher.py _port:=/dev/ttyACM0 _frame_id:=/lidar
Traceback (most recent call last):
File "/home/mason/catkin_ws/src/IEEE2014/ros/xv11_driver/scripts/neato_laser_publisher.py", line 105, in
lmp.publish(lmp_msg)
File "/opt/ros/groovy/lib/python2.7/dist-packages/rospy/topics.py", line 801, in publish
raise ROSSerializationException(str(e))
rospy.exceptions.ROSSerializationException: field packet_index must be unsigned integer type