Service call failed: transport error completing service call [closed]

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Hi everyone,

Well, i am trying to launch gazebo simulator on my system along with an object of Kuka Youbot in it. The "empty_world" command seems to be working fine and the Gazebo launches successfully. the error occurs when i try to introduce a object in it, but typing the following commands:
1. roscore in one TW 2. roslaunch youbot_description youbot_arm_description.launch in another TW and 3. roslaunch youbot_description youbot_arm_publisher.launch in an other TW

The first two commands seems to be working fine, that is the process runs successfully, but as soon as i run the third command in a TW, the gazebo runs successfully for about 5 seconds and the process dies automatically closing the Gazebo simulator and throws the following error:

"Main simulation loop failed /home/youbot/ros_stacks/simulator_gazebo/gazebo/build/gazebo/server/controllers/ControllerFactory.cc:99 : Exception: Failed to load libgazebo_ros_controller_manager.so: libgazebo_ros_controller_manager.so: cannot open shared object file: No such file or directory

Service call failed: transport error completing service call: unable to receive data from sender, check sender's logs for details spawning success None [gazebo-2] process has died [pid 2498, exit code -11]. log files: /home/youbot/.ros/log/e142418c-136d-11e1-ad57-002682c60600/gazebo-2.log [youbot_gazebo_model-3] process has finished cleanly. log file: /home/youbot/.ros/log/e142418c-136d-11e1-ad57-002682c60600/youbot_gazebo_model-3.log"

I have no clue how to proceed with this, so, please help me with this issue. Thank you in advance....

regards,

Maneesh