Player interface Peripherals++

[Brirro]

I have using Computercraft and Peripherals++ for 1.7.10, and I am trying to use the player interface, when I use pushToSlot() it will only put items into my first slot, and the documentation says that "pushToSlot(num sourceSlot, num amount, num destSlot)" But for me, the second value is the chest slot, and the third one is the amount, and it seems as if the first number does nothing.