Cannot run .model file in gazebo

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I use ros kinetic with Ubuntu 16.04 and I am currently following the gazebo tutorial on the ros wiki website: http://wiki.ros.org/simulator_gazebo/...

I have no problem to run a box.urdf file in gazebo with the following command:

rosrun gazebo_ros spawn_model -urdf -file rospack find gazebo_ros/objects/desk1.model -z 1 -model myBox

The problem is I cannot run the file myFile.model by typing:

rosrun gazebo_ros spawn_model -gazebo -file rospack find gazebo_ros/objects/desk1.model -z 1 -model myDesk.

The desk1.model is described on https://bitbucket.org/osrf/simulator_...