[JaTochNietDan]

It means what it says, the variable playerid isn't initialized or defined in that callback...if you want the callback specifically for a playerid, you need to specify it in there. For example:

pawn Код:

public cannonshot(playerid)
{
      if(IsPlayerInAnyVehicle(playerid))
      SetVehicleVelocity(GetPlayerVehicleID(playerid),-4.5,0,0.0);
}