remove inorder

launch/box.launch

 <launch>
-    <param name="box_description" command="$(find xacro)/xacro --inorder $(find panda_simulation)/models/box.xacro"/>
+    <param name="box_description" command="$(find xacro)/xacro $(find panda_simulation)/models/box.xacro"/>
     <node name="box_state_publisher" pkg="robot_state_publisher" type="robot_state_publisher" args="robot_description:=box_description" />
     <node name="spawn_object" pkg="gazebo_ros" type="spawn_model" args="-param box_description -urdf -model box"/>