missing control.launch file

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Hello

This may be something that I am over looking but, I am running through this tutorial:(https://www.clearpathrobotics.com/assets/guides/ros/Drive%20a%20Grizzly.html) each time i go to run the command

roslaunch grizzly_gazebo grizzly_empty_world.launch

I get the following error messages:

while processing /opt/ros/indigo/share/grizzly_gazebo/launch/grizzly.launch:
while processing /opt/ros/indigo/share/grizzly_navigation/launch/control.launch:
Invalid roslaunch XML syntax: [Errno 2] No such file or directory: u'/opt/ros/indigo/share/grizzly_navigation/launch/control.launch'
The traceback for the exception was written to the log file

I went to the path that is listed in the error message and indeed the file it is looking for is not there. My question does anyone know where I can find this file?