Spawning pr2 problem (pr2_simulator)

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Hello everyone,

I have problems with the pr2_simulator. I have installed it and I was following the first steps in the "Introductory Tutorials" of pr2_simulator. I was trying to spawn the pr2 robot in a Gazebo empty world.

I had to use

roslaunch gazebo_ros empty_world.launch

instead of

roslaunch gazebo_worlds empty_world.launch

in order to launch the 3d environment. (If I remember well it's because of the newer versions of Gazebo...)

However, when I launch the command

roslaunch pr2_gazebo pr2.launch

I get an error:

spawn status:  SpawnModel: Model pushed to spawn queue, but spawn service timed out waiting for model to appear in simulation under the name pr2

What can I do? :(

Thank you in advance!