title: Why Uncaught TypeError: $(...).fullCalendar is not a function?
body: <p>I imported it as below:</p>
  
  <pre><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript" src="js/jquery-3.1.1.min.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript" src="js/moment.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript" src="js/fullcalendar.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript" src="js/locale/ko.js"&gt;&lt;/script&gt;
  &lt;link rel="stylesheet" href="css/fullcalendar.css"&gt;
  &lt;link rel="stylesheet" href="css/fcImportantCSS.css"&gt;
  &lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"&gt;
  &lt;link rel="stylesheet" href="css/adminMainPage.css"&gt;
  </code></pre>
  
  <p>And I wrote the following.</p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;div id="calendarContainer" style="display:none"&gt;
      &lt;input type="hidden" value="" id="ri_startDate"&gt;
      &lt;input type="hidden" value="" id="ri_endDate"&gt;
      &lt;div id="calendar"&gt;&lt;/div&gt;
  &lt;/div&gt;  
  </code></pre>
  
  <p>JS:</p>
  
  <pre><code>// fullCalendar 관련
  $('#calendar').fullCalendar({
    header: {
      center: "title", // 센터에는 타이틀 명이 오고
      left: "prev", // 왼쪽에는 &lt; 버튼이 오고
      right: "next" // 오른쪽에는 &gt; 버튼이 오게됌
    },
    lang: 'ko', // 달력 한글 설정
    editable: true, // 달력의 이벤트를 수정할 수 있는지 여부를 결정
    dayClick: function(date, allDay, view) // 일 클릭시 발생
    {
      var dateFormat = date.format('YYYY-MM-DD');
  
      if (confirm('휴진으로 등록 하시겠습니까?')) {
  
      } else {
        alert('bye ~ ');
      }
    }
  });
  </code></pre>
  
  <p>It worked well when tested, but it does not work right now.</p>
  
  <p>The following error occurs:</p>
  
  <pre><code>Uncaught TypeError: $(...).fullCalendar is not a function
  </code></pre>
  
  <p>Why do I get this error?</p>
  
  <p>How do I fix the code to catch this error?</p>
  
  <p>I need your help, and Please tell me your opinion.</p>