jQuery-UI – “Cannot read property ‘step’ of undefined”

$( function() {
    // run the currently selected effect
    function runEffect() {
      // get effect type from
      var selectedEffect = $( "#effectTypes" ).val();
 
      // Most effect types need no options passed by default
      var options = {};
      // some effects have required parameters
      if ( selectedEffect === "scale" ) {
        options = { percent: 50 };
      } else if ( selectedEffect === "transfer" ) {
        options = { to: "#button", className: "ui-effects-transfer" };
      } else if ( selectedEffect === "size" ) {
        options = { to: { width: 200, height: 60 } };
      }
 
      // Run the effect
      $( "#effect" ).effect( selectedEffect, options, 500, callback );
    };
 
    // Callback function to bring a hidden box back
    function callback() {
      setTimeout(function() {
        $( "#effect" ).removeAttr( "style" ).hide().fadeIn();
      }, 1000 );
    };
 
    // Set effect from select menu value
    $( "#button" ).on( "click", function() {
      runEffect();
      return false;
    });
  } );

.toggler { width: 500px; height: 200px; position: relative; }
    #button { padding: .5em 1em; text-decoration: none; }
    #effect { width: 240px; height: 170px; padding: 0.4em; position: relative; }
    #effect h3 { margin: 0; padding: 0.4em; text-align: center; }
    .ui-effects-transfer { border: 2px dotted gray; }

<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<link href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/themes/smoothness/jquery-ui.css" rel="stylesheet"/>

<div class="toggler">
  <div id="effect" class="ui-widget-content ui-corner-all">
    <h3 class="ui-widget-header ui-corner-all">Effect</h3>
    <p>
      Etiam libero neque, luctus a, eleifend nec, semper at, lorem. Sed pede. Nulla lorem metus, adipiscing ut, luctus sed, hendrerit vitae, mi.
    </p>
  </div>
</div>
 
<select name="effects" id="effectTypes">
  <option value="blind">Blind</option>
  <option value="bounce">Bounce</option>
  <option value="clip">Clip</option>
  <option value="drop">Drop</option>
  <option value="explode">Explode</option>
  <option value="fade">Fade</option>
  <option value="fold">Fold</option>
  <option value="highlight">Highlight</option>
  <option value="puff">Puff</option>
  <option value="pulsate">Pulsate</option>
  <option value="scale">Scale</option>
  <option value="shake">Shake</option>
  <option value="size">Size</option>
  <option value="slide">Slide</option>
  <option value="transfer">Transfer</option>
</select>
 
<button id="button" class="ui-state-default ui-corner-all">Run Effect</button>

$( function() {
    // run the currently selected effect
    function runEffect() {
      // get effect type from
      var selectedEffect = $( "#effectTypes" ).val();
 
      // Most effect types need no options passed by default
      var options = {};
      // some effects have required parameters
      if ( selectedEffect === "scale" ) {
        options = { percent: 50 };
      } else if ( selectedEffect === "transfer" ) {
        options = { to: "#button", className: "ui-effects-transfer" };
      } else if ( selectedEffect === "size" ) {
        options = { to: { width: 200, height: 60 } };
      }
 
      // Run the effect
      $( "#effect" ).effect( selectedEffect, options, 500, callback );
    };
 
    // Callback function to bring a hidden box back
    function callback() {
      setTimeout(function() {
        $( "#effect" ).removeAttr( "style" ).hide().fadeIn();
      }, 1000 );
    };
 
    // Set effect from select menu value
    $( "#button" ).on( "click", function() {
      runEffect();
      return false;
    });
  } );

.toggler { width: 500px; height: 200px; position: relative; }
    #button { padding: .5em 1em; text-decoration: none; }
    #effect { width: 240px; height: 170px; padding: 0.4em; position: relative; }
    #effect h3 { margin: 0; padding: 0.4em; text-align: center; }
    .ui-effects-transfer { border: 2px dotted gray; }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<link href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/themes/smoothness/jquery-ui.css" rel="stylesheet"/>

<div class="toggler">
  <div id="effect" class="ui-widget-content ui-corner-all">
    <h3 class="ui-widget-header ui-corner-all">Effect</h3>
    <p>
      Etiam libero neque, luctus a, eleifend nec, semper at, lorem. Sed pede. Nulla lorem metus, adipiscing ut, luctus sed, hendrerit vitae, mi.
    </p>
  </div>
</div>
 
<select name="effects" id="effectTypes">
  <option value="blind">Blind</option>
  <option value="bounce">Bounce</option>
  <option value="clip">Clip</option>
  <option value="drop">Drop</option>
  <option value="explode">Explode</option>
  <option value="fade">Fade</option>
  <option value="fold">Fold</option>
  <option value="highlight">Highlight</option>
  <option value="puff">Puff</option>
  <option value="pulsate">Pulsate</option>
  <option value="scale">Scale</option>
  <option value="shake">Shake</option>
  <option value="size">Size</option>
  <option value="slide">Slide</option>
  <option value="transfer">Transfer</option>
</select>
 
<button id="button" class="ui-state-default ui-corner-all">Run Effect</button>