error 017: undefined symbol "IsPlayerLoggedIn"

// Lets the player choose where he wants to respawn (costs $200)
COMMAND:rescue(playerid, params[])
{
	// Send the command to all admins so they can see it
	SendAdminText(playerid, "/rescue", params);
    if(!IsPlayerLoggedIn(playerid)) return SendClientMessage(playerid, COLOR_GREY, "You need to login first before using any command.");
	// Check if the player has logged in
	if (APlayerData[playerid][LoggedIn] == true)
	{
		// Check if the player has a wanted level of less than 3
		if (GetPlayerWantedLevel(playerid) < 3)
		{
			// Check if the player isn't in jail
			if (APlayerData[playerid][PlayerJailed] == 0)
			{
				if (APlayerData[playerid][JobStarted] == false)
				{
					// Make sure you can't use "/rescue" when you're inside a vehicle (doesn't respawn you at the requested coords
					// and puts a random item (bottle, sigarette, ...) in the player's hands
					if (GetPlayerVehicleID(playerid) == 0)
					{
					    // Create a dialog based on the player's class
						switch (APlayerData[playerid][PlayerClass])
						{
							case ClassTrucker: // Ask where the trucker player wants to respawn
								ShowPlayerDialog(playerid, DialogRescue, DIALOG_STYLE_LIST, "Choose trucker spawn point:", "Fallen Tree Depot\r\nFlint Trucking Depot\r\nLVA Freight Depot\r\nDoherty Depot\r\nEl Corona Depot\r\nQuarry Top\r\nShady Creek Depot", "Spawn", "Cancel");
							case ClassBusDriver: // Ask where the busdriver wants to respawn
								ShowPlayerDialog(playerid, DialogRescue, DIALOG_STYLE_LIST, "Choose busdriver spawn point:", "Los Santos\r\nSan Fierro\r\nLas Venturas", "Spawn", "Cancel");
							case ClassPilot: // Ask where the pilot wants to respawn
								ShowPlayerDialog(playerid, DialogRescue, DIALOG_STYLE_LIST, "Choose pilot spawn point:", "Los Santos\r\nSan Fierro\r\nLas Venturas", "Spawn", "Cancel");
							case ClassPolice: // Ask where the police player wants to respawn
								ShowPlayerDialog(playerid, DialogRescue, DIALOG_STYLE_LIST, "Choose police spawn point:", "Los Santos\r\nSan Fierro\r\nLas Venturas", "Spawn", "Cancel");
							case ClassCourier: // Ask where the courier player wants to respawn
								ShowPlayerDialog(playerid, DialogRescue, DIALOG_STYLE_LIST, "Choose courier spawn point:", "Los Santos\r\nSan Fierro\r\nLas Venturas", "Spawn", "Cancel");
						}
					}
					else
						SendClientMessage(playerid, 0xFF0000FF, "You cannot use '/rescue' when you're inside a vehicle"); // "/rescue" doesn't work inside a vehicle
				}
				else
				    SendClientMessage(playerid, 0xFF0000FF, "You cannot use rescue when doing a job"); // "/rescue" doesn't work during a job
			}
			else
			    SendClientMessage(playerid, 0xFF0000FF, "You cannot use /rescue when you're in jail");
		}
		else
		    SendClientMessage(playerid, 0xFFFFFFFF, "{FF0000}You cannot use /rescue when you're wanted");
	}
	else
	    return 0;

	// Let the server know that this was a valid command
	return 1;
}

stock IsPlayerLoggedIn(playerid)
{
    if(IsPlayerConnected(playerid)) return 1;
    return 0;
}