Somehow it doesn't put the player in a vehicle

Somehow this code doesn't put the player in the vehicle.

PHP Code:

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    GetPlayerPos(playerid, X, Y, Z); 
                CreateVehicle(541, X, Y, Z, 0.0, 128, 128, -1);
                PutPlayerInVehicle(playerid, GetPlayerVehicleID(playerid), 0); 


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What do I miss?