It means you have file conflict!   Try this using OpenIV Go to: mods/update/x64/dlcpacks/sheriffpack/dlc.rpf/common/data you need to edit carcols.meta & carvariations.meta    in carcols.meta : 1) serach for    <id value="15"/>    change the value 15 to any number  e.g. 150  (must be above 20s) 2) search for   <id value="17"/> again, change the value 17 to any number  e.g. 170 (must be above 20s) save and replace.