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It looks like you have problem in your start_tilt_controller.launch file, it should look like the following:

<launch>
    !-- Start tilt joint controller --
    <rosparam file="$(find dynamixeltutorials)/tilt.yaml" command="load"/>
    <node name="tilt_controller_spawner" pkg="dynamixel_controllers" type="controller_spawner.py"
          args="--manager=dynamixel_controller_manager
                --port=dxl_tty1
                tilt_controller"
          output="screen"/>
</launch>

Note, that you have to specify the nickname you gave to your serial port not the actual device name (dxl_tty1 vs /dev/ttyUSB0).