SetPlayerCheckpoint in OnPlayerEnterCheckPoint nicht möglich

ocmd:startjob(playerid, params[])
{


	SetPlayerCheckpoint(playerid, tCPs[0][t_x], tCPs[0][t_y], tCPs    [0][t_z], 5);


	SetPVarInt(playerid, "trash_cp", 0);
	SetPVarInt(playerid, "trash_job", 1);


 	return 1;
}

public OnPlayerEnterCheckpoint(playerid)
{
	if(GetPVarInt(playerid, "trash_job"))
	{
	    //Wenn trash job ausgeführt wird
		new cID = GetPVarInt(playerid, "trash_cp");
		if(IsPlayerInRangeOfPoint(playerid, 5, tCPs[cID][t_x], tCPs[cID][t_y], tCPs[cID][t_z]))
		{
		    cID++;

		    if(cID >= sizeof(tCPs))
		    {
		        GivePlayerMoney(playerid, 200);
		        SetPVarInt(playerid, "trash_cp", 0);
				SetPlayerCheckpoint(playerid, tCPs[0][t_x], tCPs[0][t_y], tCPs[0][t_z], 5);
		    }
			else
		    {
		        SetPVarInt(playerid, "trash_cp", cID);
				SetPlayerCheckpoint(playerid, tCPs[cID][t_x], tCPs[cID][t_y], tCPs[cID][t_z], 5);
		    }
			return 1;
		}
	}
	DisablePlayerCheckpoint(playerid);
	return 1;
}

#include <a_samp>


main()
{
	print("\n----------------------------------");
	print(" Blank Gamemode by your name here");
	print("----------------------------------\n");
}


new Mull_1[MAX_PLAYERS];


public OnPlayerEnterCheckpoint(playerid)
{
	if(!Mull_1[playerid])
	{
	   	DisablePlayerCheckpoint(playerid);
		Mull_1[playerid] = 1;
		SetPlayerCheckpoint(playerid, 919.9317,-1510.0475,13.3723, 2.0);
	}
	else if (Mull_1[playerid] == 1)
	{
		DisablePlayerCheckpoint(playerid);
		Mull_1[playerid] = 2;
		SetPlayerCheckpoint(playerid, 1006.0831,-1789.1403,14.0050, 2.0);
	}
	else if (Mull_1[playerid] == 2)
	{
		DisablePlayerCheckpoint(playerid);
		Mull_1[playerid] = 3;
		SetPlayerCheckpoint(playerid, 920.1125,-1698.3658,13.3606, 2.0);
	}
	return 1;
}


public OnGameModeInit()
{
	SetGameModeText("Blank Script");
	AddPlayerClass(0, 1128.2096, -1849.9452, 13.3828, 180.00, 0, 0, 0, 0, 0, 0);
	return 1;
}


public OnGameModeExit() return 1;


public OnPlayerRequestClass(playerid, classid)
{
	SetPlayerPos(playerid, 1128.2096, -1849.9452, 13.3828);
	SetPlayerCameraPos(playerid, 1128.2096, -1855.9452, 13.3828);
	SetPlayerCameraLookAt(playerid, 1128.2096, -1849.9452, 13.3828);
	return 1;
}


public OnPlayerCommandText(playerid, cmdtext[])
{
	if (!strcmp("/startjob", cmdtext, true))
	{
		SetPlayerCheckpoint(playerid, 1128.2096, -1849.9452, 13.3828, 5.0);
		Mull_1[playerid] = 0;
		return 	SendClientMessage(playerid, 0xFFFF00FF, "Du startest den Job als Fahrer!"),
			SendClientMessage(playerid, 0xFFFF00FF, "Deine Aufgabe: Bringe deinen Kollegen sicher zu den Mülltonnen, damit er sie ausladen kann.");
	}
	return 0;
}