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Invalid roslaunch XML syntax: junk after document element: line 3, column 4

dynamixel_controllersTutorialsCreatingmetacontroller

I want to connect the dynamixel AX-64 motor with the PC, however, when I follow the tutorials and create a meta controller, I come across the following question.
I start the controller using the following command.
roslaunch my_dynamixel_tutorial start_meta_controller.launch

the ‘start_meta_controller.launch’ file is

<rosparam file="$(find my_dynamixel_tutorial)/tilt.yaml" command="load"/>
<node name="controller_spawner" pkg="dynamixel_controllers" type="controller_spawner.py"
      args="--manager=dxl_manager
            --port dxl_USB0
            joint3_controller                       
            joint4_controller
            joint5_controller
            "
      output="screen"/>
<rosparam file="$(find my_dynamixel_tutorial)/joints_trajectory_controller.yaml" command="load"/>
<node name="controller_spawner_meta" pkg="dynamixel_controllers" type="controller_spawner.py"
      args="--manager=dxl_manager
            --type=meta
            f_arm_controller
            joint3_controller
            joint4_controller
            joint5_controller
                                            
            "
            
                      output="screen"/>

And the error is:
… logging to /home/acer/.ros/log/63b699b2-a98e-11e7-b094-28e34739f5b2/roslaunch-acer-ubuntu-5609.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

Invalid roslaunch XML syntax: junk after document element: line 3, column 4
The traceback for the exception was written to the log file

How to solve the problem? Thanks in advance.

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