[JaTochNietDan]

It's complaining about that because you actually do have a return value in certain cases, but not in all cases. It's complaining because you should have a return value in all cases if you're going to have any at all.

So consider adding:

pawn Код:

return -1;

To the end. You could use it to specify when there are no empty passenger slots, for example:

pawn Код:

new slot = GetNextEmptyDoorSlot();

if(slot != -1) PutPlayerInVehicle(playerid, vehicleid, slot);

I hope that makes sense.