Attempt to index ? (a nil value)

Hey guys, I need a little help… I downloaded direwolf20's button api and his demo program, and after testing it to see if it worked, i moved around and got rid of some buttons from the demo program. didnt edit the button api except for changing the "peripheral.wrap" to "right", and now im getting "button:63: attempt to index ? (a nil value)" whenever i try to click the button on the monitor…

Button API- pastebin.com/8Gbj3HmP
Demo- pastebin.com/HRbMF1Eg

You appear to have linked two nearly identical copies of the same API. The only change that stands out to me is the first line.

Line 63 would throw that error if you attempted to toggle a button which has somehow been deleted from memory. Difficult to say without seeing your code.