Hii!, I have a problem. When I try to run $roslaunch gazeboworlds emptyworld.launch, i get this message:

... logging to /home/mystery/.ros/log/29ff36fe-9493-11e1-9c3e-00262d845d75/roslaunch-mystery-Aspire-5740-1281.log Checking log directory for disk usage. This may take awhile. Press Ctrl-C to interrupt Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://mystery-Aspire-5740:50215/

SUMMARY

PARAMETERS * /rosversion * /usesimtime * /rosdistro

NODES / gazebo (gazebo/gazebo)

auto-starting new master process[master]: started with pid [1303] ROSMASTERURI=http://localhost:11311

setting /run_id to 29ff36fe-9493-11e1-9c3e-00262d845d75 process[rosout-1]: started with pid [1316] started core service [/rosout] process[gazebo-2]: started with pid [1319] Gazebo multi-robot simulator, version 0.10.0

Part of the Player/Stage Project [http://playerstage.sourceforge.net]. Copyright (C) 2003 Nate Koenig, Andrew Howard, and contributors. Released under the GNU General Public License.

gazebo: /home/mystery/Descargas/ogresrcv1-7-4/OgreMain/include/OgreSingleton.h:80: Ogre::Singleton::Singleton() [with T = Ogre::TerrainPageSourceListenerManager]: Assertion `!ms_Singleton' failed. [gazebo-2] process has died [pid 1319, exit code -6]. log files: /home/mystery/.ros/log/29ff36fe-9493-11e1-9c3e-00262d845d75/gazebo-2*.log

and try to run too $roslaunch turtlebotgazebo turtlebotempty_world.launch :

... logging to /home/mystery/.ros/log/79b5f7dc-9493-11e1-969d-00262d845d75/roslaunch-mystery-Aspire-5740-1354.log Checking log directory for disk usage. This may take awhile. Press Ctrl-C to interrupt Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://mystery-Aspire-5740:50489/

SUMMARY

PARAMETERS * /usesimtime * /robotposeekf/sensortimeout * /diagnosticaggregator/analyzers/sensors/path * /robotposeekf/imuused * /robotposeekf/odomused * /robotposeekf/voused * /diagnosticaggregator/analyzers/nodes/timeout * /diagnosticaggregator/analyzers/mode/timeout * /pointcloudthrottle/maxrate * /diagnosticaggregator/analyzers/sensors/timeout * /diagnosticaggregator/analyzers/power/type * /diagnosticaggregator/analyzers/power/timeout * /diagnosticaggregator/analyzers/mode/type * /kinectlaser/minheight * /diagnosticaggregator/analyzers/digitalio/path * /kinectlasernarrow/maxheight * /diagnosticaggregator/analyzers/digitalio/timeout * /kinectlaser/maxheight * /diagnosticaggregator/analyzers/nodes/path * /rosdistro * /robotdescription * /kinectlasernarrow/outputframeid * /diagnosticaggregator/basepath * /robotposeekf/freq * /diagnosticaggregator/analyzers/sensors/type * /diagnosticaggregator/analyzers/digitalio/startswith * /diagnosticaggregator/analyzers/power/path * /diagnosticaggregator/analyzers/mode/path * /robotstatepublisher/publishfrequency * /diagnosticaggregator/analyzers/mode/startswith * /rosversion * /diagnosticaggregator/pubrate * /diagnosticaggregator/analyzers/digitalio/type * /diagnosticaggregator/analyzers/sensors/startswith * /diagnosticaggregator/analyzers/power/startswith * /kinectlasernarrow/minheight * /kinectlaser/outputframeid * /robotposeekf/publishtf * /diagnosticaggregator/analyzers/nodes/type * /diagnosticaggregator/analyzers/nodes/contains

NODES / gazebo (gazebo/gazebo) spawnturtlebotmodel (gazebo/spawnmodel) diagnosticaggregator (diagnosticaggregator/aggregatornode) robotstatepublisher (robotstatepublisher/statepublisher) robotposeekf (robotposeekf/robotposeekf) pointcloudthrottle (nodelet/nodelet) kinectlaser (nodelet/nodelet) kinectlaser_narrow (nodelet/nodelet)

auto-starting new master process[master]: started with pid [1444] ROSMASTERURI=http://localhost:11311

setting /runid to 79b5f7dc-9493-11e1-969d-00262d845d75 process[rosout-1]: started with pid [1458] started core service [/rosout] process[gazebo-2]: started with pid [1472] process[spawnturtlebotmodel-3]: started with pid [1473] process[diagnosticaggregator-4]: started with pid [1474] process[robotstatepublisher-5]: started with pid [1475] process[robotposeekf-6]: started with pid [1476] process[pointcloudthrottle-7]: started with pid [1482] process[kinectlaser-8]: started with pid [1488] process[kinectlasernarrow-9]: started with pid [1501] Gazebo multi-robot simulator, version 0.10.0

Part of the Player/Stage Project [http://playerstage.sourceforge.net]. Copyright (C) 2003 Nate Koenig, Andrew Howard, and contributors. Released under the GNU General Public License.

[ WARN] [1335989693.339978235]: The root link basefootprint has an inertia specified in the URDF, but KDL does not support a root link with an inertia. As a workaround, you can add an extra dummy link to your URDF. gazebo: /home/mystery/Descargas/ogresrcv1-7-4/OgreMain/include/OgreSingleton.h:80: Ogre::Singleton::Singleton() [with T = Ogre::TerrainPageSourceListenerManager]: Assertion `!msSingleton' failed. [gazebo-2] process has died [pid 1472, exit code -6]. log files: /home/mystery/.ros/log/79b5f7dc-9493-11e1-969d-00262d845d75/gazebo-2*.log

where is the problem? please help