Bus missions not working, specifically "1 star diner"

When I'm in a wentwardbus, I approach the mission that involves driving the route 1 to star diner in west coast usa. However, when I press "start", no vehicle appears. No normal functions take place.
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By the way that is what shows when the bus refuses to show. DDoes this mean anything?

 

Uninstall all your bus mods and try it again. Also clear your cache.

 

Hello. The normal 40 foot unmodded bus will work, but a 60 foot modded bus has the same problem, after I uninstalled and cleared the cache
I wanted to try with missions because beamng wont let my bus stop at the bus stop because of the awfully designed useless fixed boundaries that the bus has to be in if I use the "bus routes" in main menu, and the 60 foot bus cannnot fit. I might have to make another thread for this if the current mission related issue cannot be fixed, unless you know a different way.