Actually this happend at most old mods at v0.25(especially mods created between 0.17-0.22,this DB11 is one of them), due to the change of the Electronic Stability System(for example:etkc_ESC,it have a lot of functions,such as drivemodes),now they called Driving&Safety System(etkc_DSE_abs,etkc_DSE_drivemodes .etc),they have different ways and lua code to works, so just wait the author to release update(But I think it's unlikely,the author probably abandoned this mod for a long time),or fix by yourself