TruckersMP does not support the latest game version of American Truck Simulator and Euro Truck Simulator 2 yet.
Check out the following guide on how to downgrade so you can continue playing on multiplayer: How to downgrade
Some say, in a dark cave deep underground, there is a group of developers sitting.
Some even call them the "Knights of the round serverrack".
Everything that touches the project needs to be unit tested and reviewed!