GPIO buttons (next,previous,pause) not working.

[mano1979]

I build a keypad according to this page:

https://github.com/colloqi/piSignage/blob/master/GPIO%20media%20control%20Instructions.md

But i can't get it to work. I tried installing the onoff node with npm. but still not working.
And i ofcourse did enable it in the settings of the player.

Any help is greatly appreciated.