Cannot read property 'extend' of undefined

[xahon]

on line 20

this.options = Waypoint.Adapter.extend({}, Waypoint.defaults, options);

[aastudio]

Same issue for me !

[rttmax]

+1

[nadavrt]

Hi guys. Are you perhaps using Waypoints with jQuery? The new default Waypoints doesn't work with jQuery and will generate this error. If you are using jQuery make sure to download the jQuery version (jquery.waypoints.js or jquery.waypoints.min.js) and use it instead.

[Grundmanis]

Had the same issue, did like @nadavrt said and now it works, but to be honest I had a problem to find jquery.waypoints.js... For those who will try to find it: waypoints/libs/jquery.waypoints.js