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Dear Samsoem

Thank you very much for responding and i tried yours and this is what I had found and faced ..... please check this and respond to the result what we got ..... hope it will be understandable to you.

for this i tried running the third one second and second one third and the gazebo launches successfully without the robot object in it..... but before it says "Gazebo launches successfully" it gives few red lines, mentioned below:

loading model xml from ros parameter Traceback (most recent call last): File "/home/youbot/ros_stacks/simulator_gazebo/gazebo/scripts/spawn_model", line 227, in <module> sm.callSpawnService() File "/home/youbot/ros_stacks/simulator_gazebo/gazebo/scripts/spawn_model", line 183, in callSpawnService model_xml = rospy.get_param(self.param_name) File "/home/youbot/ros_stacks/ros_comm/clients/rospy/src/rospy/client.py", line 377, in get_param return _param_server[param_name] #MasterProxy does all the magic for us File "/home/youbot/ros_stacks/ros_comm/clients/rospy/src/rospy/msproxy.py", line 117, in __getitem__ raise KeyError(key) KeyError: 'robot_description' do_wait: drmWaitVBlank returned -1, IRQs don't seem to be working correctly. Try adjusting the vblank_mode configuration parameter. [robot_state_publisher-4] process has died [pid 2659, exit code 255]. log files: /home/youbot/.ros/log/8d993482-15a7-11e1-9a5d-002682c60600/robot_state_publisher-4.log [youbot_gazebo_model-3] process has died [pid 2658, exit code 1]. log files: /home/youbot/.ros/log/8d993482-15a7-11e1-9a5d-002682c60600/youbot_gazebo_model-3.log directory [/tmp/gazebo-youbot-0] already exists (previous crash?) the owner gazebo server (pid=2089) is not running. deleting the old information of the directory [/tmp/gazebo-youbot-0] Param [quickStep] is deprecated: [replace quickStep with stepType] Param [quickStepIters] is deprecated: [replace quickStepIters with stepIters] Param [quickStepW] is deprecated: [replace quickStepW with stepW] Gazebo successfully initialized