I was super excited about this map until i realized over in sandy shores there a alot of duplicate postals sadly. I will readd this to my single player if this gets fixed
I had the extra slots POLICE30_FBI30 with lml working great then got the same error message with crash. So what i did was i took it out and installed the original file from extra slots and then i slowly added the car variations and meta files from the POLICE30_FBI30 slot files to that one and now im back to being able to add as many cars as i want through extra slots and i use the added menu to spawn. Hope this helps.