Piano Keys project problem

So for some reason when i am doing this project everything works out just perfect exept the last button whitch randomly stops working. The picture will show the code of the button and until where it works, from the red line downwards the code just doesnt work (on that button).
If possible could anyone help me out with this piece of code.

"word-tree"  

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THANKS, i spent like 40 min looking for the error.

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