I tried the example: MAVROS Offboard control example and everything worked perfectly. After that I tried to install Moveit! I initialized Moveit Setup Assistant and tried to load iris.xacro model from path : "~/src/Firmware/Tools/sitl_gazebo/models/rotors_description/urdf/iris.xacro", but I got this message: Running xacro failed. The terminal error output was "Undefined substitution argument rotors_description_dir None when processing file: /home/john/src/Firmware/Tools/sitl_gazebo/models/rotors_description/urdf/iris.xacro"
What can i do in order to use iris model with moveit ?