[DJDhan]

It's probably because you are not returning 1 at the end of the function "HiddenTrailerMissions".

EDIT: I am guessing you want to detect if the vehicle the player is in is one of the hidden trailers.

Instead of running a timer, you can use OnPlayerEnterVehicle callback like so:

Код:

public OnPlayerEnterVehicle(playerid,vehicleid)
{
	if(GetVehicleModel(GetVehicleTrailer(vehicleid)) == 591)
	{
		SetPlayerCheckpoint(playerid, -1073.4313, -1306.4890, 129.2188, 15);
		SendClientMessage(playerid, HIDDEN, "You have found a hidden trailer!");
		SendClientMessage(playerid, HIDDEN, "Deliver it to 'The Den'");
	}
	return 1;
}