[yellow]

Write it like this

Код:

CMD:createveh(playerid, params[])
{
    new
        vehid,colorid1,colorid2,Float:p[3];
    if (sscanf(params, "iii", vehid, colourid1, colourid2))return SendClientMessage(playerid, 0xFFFFFFFF, "Usage: /createveh [Vehicle ID] [Coulour 1 ID] [Colour 2 ID]");
    
        GetPlayerPos(playerid, p[0],p[1],p[2]);
        new v = CreateVehicle(vehid, p[0],p[1],p[2], 0, color1, color2, 1);
PutPlayerInVehicle(playerid,v,1);// Puts player in the Vehicle
        return 1;
   
}

You had if (sscanf(params, "iii", vehid, colourid1, colourid2,x,y,z.
That's wrong cause' you have "iii". and because of that you need 3 params. vehid = 1, c1 = 2 & c2 = 3. x,y,z are 3 to much