Why do you talk about yourself in third person
Daniel S. vs Daniel.S
I think he means he can't find the armatures to call mount0, mount1...
In the top left corner, you'll see "Add", click on that, then go down the menu to "Armature", and click "Single Bone". This is what you call "mount0" for the driver, and "mount1", "mount2", etc for the other seats.