SMPA30 means I know these kind of errors r caused due to improper moding If you created a mod then you should recheck it that every part is there of the vehical e.g 1.if u r creating a mod which replaces infrernus then the all parts of infernus should be there as some infernus has a spoiler(extra) if extra part is removed then u will get error the vehical should contain all the parts that the orignal vehical of game has if the orginal of game contains 23 parts so the created one also contain 23 parts with exact name if there r only 20 parts you will get the error Start a new game or revert all modded cars, load the savegame, remove all the modded cars from parking lots, save game, remove modded cars. Then you can continue playing normally.