Error while running cmd_vel_mux

process[nodelet_manager-2]: started with pid [2375]
process[velocity_multiplexer-3]: started with pid [2376]
[ERROR] [1398544676.375860721]: Failed to load nodelet [/velocity_multiplexer] of type [cmd_vel_mux/CmdVelMuxNodelet]: Failed to load library /opt/ros/fuerte/stacks/yujin_ocs/cmd_vel_mux/lib/libcmd_vel_mux_nodelet.so. Make sure that you are calling the PLUGINLIB_REGISTER_CLASS macro in the library code, and that names are consistent between this macro and your XML. Error string: Cannot load library: /opt/ros/fuerte/stacks/yujin_ocs/cmd_vel_mux/lib/libcmd_vel_mux_nodelet.so: undefined symbol: _ZN9CmdVelMux18currentPosCallbackERKN5boost10shared_ptrIKN13geometry_msgs26PoseWithCovarianceStamped_ISaIvEEEEE
[FATAL] [1398544676.376220250]: Service call failed!
[velocity_multiplexer-3] process has died [pid 2376, exit code 255, cmd /opt/ros/fuerte/stacks/nodelet_core/nodelet/bin/nodelet load cmd_vel_mux/CmdVelMuxNodelet nodelet_manager cmd_vel_mux/mux_cmd_vel:=mobile_base/commands/velocity cmd_vel_mux/web_cmd_vel:=web_app_teleop cmd_vel_mux/key_cmd_vel:=key_cmd_vel __name:=velocity_multiplexer __log:=/root/.ros/log/a56bcc38-cd82-11e3-8c4f-74e54372e06f/velocity_multiplexer-3.log].
log file: /root/.ros/log/a56bcc38-cd82-11e3-8c4f-74e54372e06f/velocity_multiplexer-3*.log