its the giant truck pack, did you download it?
after you download it follow this
1.make a new folder and name it v4 and place it in the vehicle folder
2. copy everything from your v4 folder with all your trucks and paste it to the new v4 folder
3. go into your truck folder and copy everything and paste everything into the new v4 folder with all your trucks
4. clear and regain cashe and the truck should work