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xacro is complaining about not being able to find the package open_manipulator_description (that is referred to in your xacro file?). Is that package installed on your system ?

If not you can install it using:

sudo apt-get install -y ros-melodic-open-manipulator-description

The message "xacro: in-order processing became default in ROS Melodic. You can drop the option." means that you don't have to pass the --in-order flag to xacro anymore as in order processing is now the default behavior. However not passing the option will not solve your problem, just make the warning go away.