We are aware that American Truck Simulator and Euro Truck Simulator 2 have had an update to 1.55.
Whilst we work on updating TruckersMP with the new update, you can still play by downgrading your game version.
You can find more information here: https://truckersmp.com/kb/26
In the meantime, why not join our Discord guild? You can get updates on when it's released in the #truckersmp-updates channel.
Find out how to join our Discord here.
Thank you for your patience.