PX4 moveit iris.xacro

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I have a problem with moveit and PX4 iris model. More specifically I get that error:

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

Could anyone help?

I'm trying to apply OMPL algorithms in iris.xacro model through Moveit.

ROS: kinetic