jquery - Why do I get this error? TypeError: $popover.data(...) is undefined -

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what causing error onhover? error is:

typeerror: $popover.data(...) undefined.

$(function () {      var overpopup = false;      $('[rel=popover]').popover({         trigger: 'manual',         placement: 'bottom'      // replacing hover mouseover , mouseout     }).mouseover(function (e) {         // when hovering on element has popover, hide         // them except current 1 being hovered upon         $('[rel=popover]').not('#' + $(this).attr('id')).popover('hide');         var $popover = $(this);         $popover.popover('show');          // set flag when move button popover         // dirty way think of prevent         // closing popover when navigate across         // white space between 2         $popover.data('popover').tip().mouseenter(function () {             overpopup = true;         }).mouseleave(function () {             overpopup = false;             $popover.popover('hide');         });      }).mouseout(function (e) {         // on mouse out of button, close related popover         // in 200 milliseconds if you're not hovering on popover         var $popover = $(this);         settimeout(function () {             if (!overpopup) {                 $popover.popover('hide');             }         }, 200);     }); });  <a href="#" id="example1" class="btn large primary" rel="popover" data-content="example 1!!!" data-original-title="example 1 title">button 1</a> <a href="#" id="example2" class="btn large primary" rel="popover" data-content="example 2!!!" data-original-title="example 2 title">button 2</a> <a href="#" id="example3" class="btn large primary" rel="popover" data-content="example 3!!!" data-original-title="example 3 title">button 3</a>

this error because either using older version of jquery library or have not loaded angularjs library. thought not other reason error.


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