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I have the same error with 12.04 and Hydro. The empty world option with self-generated objects as mentioned above is a workaround but that also means we cannot use Gazebo's database of models. Hopefully, someone can make a permanent fix for this.

Update: It works if you manually download the required models onto your computer. I found this information over here (http://answers.gazebosim.org/question/4399/turtlebot_gazebo-world-not-loading-models/)

wget http://gazebosim.org/models/dumpster/model.tar.gz
tar xvf model.tar.gz -C ~/.gazebo/models

And then do the same for whichever model you want from here (http://gazebosim.org/models/)

I have the same error with 12.04 and Hydro. The empty world option with self-generated objects as mentioned above is a workaround but that also means we cannot use Gazebo's database of models. Hopefully, someone can make a permanent fix for this.

Update: It works if you manually download the required models onto your computer. I found this information over here (http://answers.gazebosim.org/question/4399/turtlebot_gazebo-world-not-loading-models/)here.

wget http://gazebosim.org/models/dumpster/model.tar.gz
tar xvf model.tar.gz -C ~/.gazebo/models

And then do the same for whichever model you want from here (http://gazebosim.org/models/)here

I have the same error with 12.04 and Hydro. The empty world option with self-generated objects as mentioned above is a workaround but that also means we cannot use Gazebo's database of models. Hopefully, someone can make a permanent fix for this.