You're launching it from truckersmp launcher right?
Also check where you installed the mod and if it's in the actual ATS Directory.
Another thing to consider is that you should have the game legally bought from steam, which you probably have.
A thing to try:
Reinstall the Mod;
If it did not work, reinstall ATS and install the mod. That's all I can say.
If you can provide me with some more information I maybe can help you even more. Do you get any errors?
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