Hello. Welcome to TMP forum
Follow these guides:
You should start TruckersMP as admin. This is really important.
Also try to start TruckersMP with DirectX (64)
> Go to your steam App
> Go to library
> Go to ETS 2 / ATS
> Click "Play" http://prntscr.com/i96kvu
> Choose "Launch with DirectX (64-bit) http://prntscr.com/i96l3x Make sure you chose 64 bit.
> Start ETS 2
> Choose your profile and press "drive"
> Close ETS 2
> Start TruckersMP as admin. TruckersMP will start with DirectX for all time. Except you change it again.
Also try to reinstall TruckersMP.
Go to '%programdata%' (http://prntscr.com/i96omv) and delete the folder 'TruckersMP'. After that uninstall TruckersMP and download the MOD again. https://truckersmp.com/download -> Launch the installer as admin
Make sure you have these programs, for the execution of the TMP launcher
.Net Framework (4.7),
Microsoft Visual C++ 2015.
and don't forget to verify your game files!