Model not provided in repository

[B6Infinity]

In line 9 of the model.sdf file of iris_with_ardupilot

<include>
      <uri>model://gimbal_small_2d</uri>
      <pose>0 -0.01 0.070 1.57 0 1.57</pose>
</include>

However, no model with the name of gimbal_small_2d is provided in the entire repository, nor there is any direction on how and where to obtain that model.

[srmainwaring]

This is one of the models available in the Gazebo Classic models database: http://models.gazebosim.org/gimbal_small_2d/.

You may need to install these locally or if you have them already check the resource path includes them.