[Deal-or-die]

This is my error

Code:

(4717) : error 076: syntax error in the expression, or invalid function call
(4731) : error 076: syntax error in the expression, or invalid function call

This is my stock

pawn Code:

stock RegisteredPlate(playerid)
{
    new string[50];
    format(string,sizeof(string),"{000000}%c%c%c-%i%i%i",(65+random(26)),(65+random(26)),(65+random(26)),random(10),random(10),random(10));
    return string;
}

Where I want the stock called.

pawn Code:

if(response)
{
    if(IsPlayerInRangeOfPoint(playerid, 7.0, GrottiSalesPos_X,GrottiSalesPos_Y,GrottiSalesPos_Z))//Grotti Dealership.
    {
        SetVehicleNumberPlate(car, RegisteredPlate);
//---------------^ Row 4717 ^-----------
        format(query,sizeof(query), "INSERT INTO `vehicles`('%d','%s')",VehicleColour[playerid][1],RegisteredPlate);
//---------------^ Row 4731 ^-----------
        mysql_query(query);
        SendClientMessage(playerid, COLOR_GREEN, "Vehicle Purchased");
        return 1;
    }

Ideas?
I know that I am probably going to slap myself later for something blindingly obvious. But I can't see it at the moment hence the reason I am asking.