Gazebo parse problem with Groovy [closed]

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Hello,

I have just installed ros-groovy and when I try to run the gazebo example:

roslaunch gazebo_worlds empty_world.launch

there is no problem, but if I try to lauch any of the other examples with:

roslaunch gazebo_worlds office_world.launch

I have some errors:

Msg Waiting for master.Warning [parser.cc:377] SDF has no <sdf> element in
file[/opt/ros/groovy/stacks/simulator_gazebo/gazebo_worlds/worlds/simple_office.world]
Error:   Could not find the 'robot' element in the xml file
         at line 59 in
/tmp/buildd/ros-groovy-urdfdom-0.2.7-0precise-20130326-0224/urdf_parser/src/model.cpp
Error [parser_urdf.cc:1814] Unable to call parseURDF on robot model
Warning [parser.cc:377] SDF has no <sdf> element in file[urdf file]
Error [parser.cc:291] parse as old urdf model file failed.
Error [Server.cc:253] Unable to read sdf
file[/opt/ros/groovy/stacks/simulator_gazebo/gazebo_worlds/worlds/simple_office.world]
Segmentation fault (core dumped)
[gazebo-2] process has died [pid 29155, exit code 139, cmd
/opt/ros/groovy/stacks/simulator_gazebo/gazebo/scripts/gazebo
/opt/ros/groovy/stacks/simulator_gazebo/gazebo_worlds/worlds/simple_office.world
__name:=gazebo
__log:=/home/tseco/.ros/log/a6bdf53c-eae5-11e2-9efd-3cd92b6f7a37/gazebo-2.log].
log file:
/home/tseco/.ros/log/a6bdf53c-eae5-11e2-9efd-3cd92b6f7a37/gazebo-2*.log

Any suggestions?

Best regards,