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i solved the problem, but the new problem comes. I start a empty gazebo, and want to join in the summit xl.urdf to simulate the rover in gazebo. Here are the results: Msg Connected to gazebo master @ http://localhost:11345 LightListWidget::OnLightMsg Warning [parser.cc:348] Gazebo SDF has no gazebo element Warning [parser.cc:291] DEPRECATED GAZEBO MODEL FILE On July 1st, 2012, this formate will no longer by supported Convert your files using the gzsdf command line tool You have been warned!

Error [MeshManager.cc:84] Invalid mesh filename extension[/home/nico/fuerte_workspace/sandbox/summit_xl_sim/summit_xl_description/meshes/summit_xl_chassis_cam1.mesh] Exception [Visual.cc:1427] Unable to create a mesh from /home/nico/fuerte_workspace/sandbox/summit_xl_sim/summit_xl_description/meshes/summit_xl_chassis_cam1.mesh

Qt has caught an exception thrown from an event handler. Throwing exceptions from an event handler is not supported in Qt. You must reimplement QApplication::notify() and catch all exceptions there.

terminate called after throwing an instance of 'gazebo::common::Exception' Error [Plugin.hh:101] Failed to load plugin libgazebo_ros_time.so: libgazebo_ros_time.so: cannot open shared object file: No such file or directory Dbg plugin model name: summit_xl /opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/gui: 行 2: 11049 已放弃 (核心已转储) rospack find gazebo/gazebo/bin/gzclient -g rospack find gazebo/lib/libgazebo_ros_paths_plugin.so [gazebo_gui-2] process has died [pid 11046, exit code 134, cmd /opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/gui __name:=gazebo_gui __log:=/home/nico/.ros/log/eb4b8668-2d55-11e2-8cc9-001f3c927c3f/gazebo_gui-2.log]. log file: /home/nico/.ros/log/eb4b8668-2d55-11e2-8cc9-001f3c927c3f/gazebo_gui-2.log Error [MeshManager.cc:84] Invalid mesh filename extension[/home/nico/fuerte_workspace/sandbox/summit_xl_sim/summit_xl_description/meshes/summit_xl_chassis_cam1.mesh] Segmentation fault (core dumped) [gazebo-1] process has died [pid 11039, exit code 139, cmd /opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/gazebo /opt/ros/fuerte/stacks/simulator_gazebo/gazebo_worlds/worlds/empty.world __name:=gazebo __log:=/home/nico/.ros/log/eb4b8668-2d55-11e2-8cc9-001f3c927c3f/gazebo-1.log]. log file: /home/nico/.ros/log/eb4b8668-2d55-11e2-8cc9-001f3c927c3f/gazebo-1.log all processes on machine have died, roslaunch will exit shutting down processing monitor... ... shutting down processing monitor complete done anybody can help me, thank you. nico