Last update: 26 Mar 2021 17:07 UTC
Short link to this article: https://truckersmp.com/index.php/kb/22
Those errors usually occur when having entered a wrong Euro Truck Simulator 2 / American Truck Simulator directory during the TruckersMP Installation.
For that reason you should uninstall the TruckersMP Launcher and install it once again.
If the above Solution does not solve your Problem, please contact our Support Team here. If you need help while creating a Support Ticket, take a look at this article.