turtlebot not moving after customizing stage simulator

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Hi, After following the tutorial to customize the stage simulator ( http://wiki.ros.org/turtlebot_stage/T... ) steps 1 and 2, the turtlebot can't move anymore even when launched keyboard teleop (roslaunch turtlebot_teleop keyboard_teleop.launch) or when set 2D navigation goal.

When rostopic echo /odom, can see that the robot wheels are rotating, but robot remains stationary.

Platform: Ubuntu 14.04 Version: ROS Indigo 1.11.21

Thank you very much for your help.