Message: Interface\AddOns\GearHelper\GearHelper.lua:834: attempt to call method 'GetChecked' (a nil value)
Time: Thu Aug 4 16:34:28 2016
Stack: Interface\AddOns\GearHelper\GearHelper.lua:834: in function <Interface\AddOns\GearHelper\GearHelper.lua:833>
Just to clarify (and for others reading), nothing was changed or deprecated. The :GetChecked() method doesn't exist on a normal button object. You just needed to create the correct type of widget.
"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh