Xacro include breaks including xacro file

I have a xacro file named "diff_wheeled_robot.urdf.xacro" to describe a robot and it works just fine. It is including other xacro files and their xacro macros. Now I want to include another xacro file describing a laser. The following code is the laser file ("rplidar.urdf.xacro"): Gazebo/Bluefalse${rplidar_radius/2} 0 0 0 0 0true10800003.141592653590.158.00.001/scanrplidar_link But when I try to include it via and I run rosrun xacro xacro --inorder diff_wheeled_robot.urdf.xacro I get an error: No such file or directory: None None when processing file: diff_wheeled_robot.urdf.xacro What am I doing wrong? ROS Kinetic Ubuntu 16.04