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What namespace does gazebo expects?

HI all,

I installed Ubuntu 14.04 and ros indigo. And gazebo 2.2 also got installed along with it (was not expecting as it is being said that gazebo needs to be installed separately). While running some sample worlds, I found that it waits for certain namesapce. and after few trials gives up. What namespace is it looking for?

The console output is:


$roslaunch gazebo_ros empty_world.launch
....
Warning [ModelDatabase.cc:334] Getting models from[http://gazebosim.org/models/]. This may take a few seconds.

Msg Connected to gazebo master @ http://127.0.0.1:11345
Msg Publicized address: 172.22.52.63
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Error [gazebo.cc:220] Waited 11 seconds for namespaces. Giving up.
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
[ INFO] [1408212911.275419703, 0.023000000]: waitForService: Service [/gazebo/set_physics_properties] is now available.
[ INFO] [1408212911.340969773, 0.086000000]: Physics dynamic reconfigure ready.

After this, the world seems to be spawning fine. But, what namespace is it looking for??