position() returning undefined in wordpress but works perfect locally

position() returning undefined in wordpress but works perfect locally

I;ve built a content slider that works perfectly on my local computer but within wordpress it's stumbling on the following:

var begin_position = jQuery("#individual_story_wrapper").position().top;

I'm getting the follow error:
: jQuery(...).position(...) is undefined

Yet locally, the slideshow runs fine and I can see the position being changed as I animate the individual_story_wrapper up and down.