Robot model is covered with white box. what can i do?

Hello. I studying gazebo tutorial in kinetic.

robot model is covered with box like above the picture.
and robot model exist in the box.

Who can slove this problem?

thanks.

Hello kan:

Could you please post the question in http://answers.gazebosim.org/ ? That is the place that we usually use for doubts or problems about Gazebo.

Thanks.