Error running launch files in Groovy

[vvanirudh]

I am using ROS groovy and built the "fuerte" branch of tum_simulator (with minor modifications) on my machine. But when I try to run a launch file (roslaunch cvg_sim_test outdoor_flight.launch), I get the following error.

Error [parser.cc:712] XML Element[filename], child of element[mesh] not defined in SDF. Ignoring.[mesh]
Error [parser.cc:703] Error reading element
Error [parser.cc:703] Error reading element
Error [parser.cc:703] Error reading element
Error [parser.cc:703] Error reading element
Error [parser.cc:703] Error reading element
Error [parser.cc:703] Error reading element
Error [parser.cc:369] Unable to read element
Error: Could not find the 'robot' element in the xml file
at line 59 in /tmp/buildd/ros-groovy-urdfdom-0.2.8-2precise-20140821-0955/urdf_parser/src/model.cpp
Error [parser_urdf.cc:1814] Unable to call parseURDF on robot model
Error [parser.cc:291] parse as old urdf model file failed.
Error [Server.cc:253] Unable to read sdf file[/home/anirudh/workspace/sandbox/tum_simulator/cvg_sim_gazebo/worlds/rolling_landscape_120m.world]
Msg Waiting for master.process[rviz-8]: started with pid [22287]
Segmentation fault (core dumped)
[gazebo-2] process has died [pid 22209, exit code 139, cmd /opt/ros/groovy/stacks/simulator_gazebo/gazebo/scripts/gazebo /home/anirudh/workspace/sandbox/tum_simulator/cvg_sim_gazebo/worlds/rolling_landscape_120m.world __name:=gazebo _log:=/home/anirudh/.ros/log/60231384-b049-11e4-9fea-28d2449c2e88/gazebo-2.log].
log file: /home/anirudh/.ros/log/60231384-b049-11e4-9fea-28d2449c2e88/gazebo-2.log
ERROR: the config file '/home/anirudh/workspace/sandbox/tum_simulator/cvg_sim_test/rviz_cfg/outdoor_flight.vcg' is a .vcg file, which is the old rviz config format.
New config files have a .rviz extension and use YAML formatting. The format changed
between Fuerte and Groovy. There is not (yet) an automated conversion program.
[rviz-8] process has died [pid 22287, exit code 1, cmd /opt/ros/groovy/lib/rviz/rviz -d /home/anirudh/workspace/sandbox/tum_simulator/cvg_sim_test/rviz_cfg/outdoor_flight.vcg __name:=rviz _log:=/home/anirudh/.ros/log/60231384-b049-11e4-9fea-28d2449c2e88/rviz-8.log].
log file: /home/anirudh/.ros/log/60231384-b049-11e4-9fea-28d2449c2e88/rviz-8.log

How do I resolve this? The way I understand it is that there seems to be a rviz configuration problem, in addition to some other errors.