Trying to send to hellog world over arduino serial

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Update: Tried to deleting ros_lib and recompiling getting same results. Note: I am using a MacPro running ubuntu 13.04 the USB is 3.0.

Trying to send to hello world over arduino serial get the following error: Running Hydro

rosrun rosserial_python serial_node.py /dev/ttyACM0
[INFO] [WallTime: 1390939261.052431] ROS Serial Python Node
[INFO] [WallTime: 1390939261.059605] Connecting to /dev/ttyACM0 at 57600 baud




[ERROR] [WallTime: 1390939353.203464] Unable to sync with device; possible link problem or link software version mismatch such as hydro rosserial_python with groovy Arduino