UIAElementNil is not a function (evaluating 'aButton.isNotNil()') on line 53 of buttonHandler.js

i faced a problem ,"UIAElementNil is not a function (evaluating 'aButton.isNotNil()') on line 53 of buttonHandler.js",why?

[BruceBGordon]

I believe the problem is that the code as provided has dependencies that are not available.

ButtonHandler uses isNotNil() which is an extension provided by tuneup.js. Another problem is the extension on the same line validAndVisible(). I will unroll these extensions and remove the unnecessary dependencies in a forthcoming pull request.

[truebit]

method validAndVisible() does not exists either, should use isValid() && isVisible() instead

[BruceBGordon]

should be fixed with commit 4317af5