TypeError: $(...).calendar is not a function

[rclerc]

I'm trying to use this calendar, but it doesn't work . I don't know why. this is my code : `

  <nav class="navbar justify-content-center navbar-default">
    <div class="container-fluid">
      <div class="navbar-header">
        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
          <span class="sr-only">Toggle navigation</span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
        </button>
        
        <a class="navbar-brand" href="/Suivi_CSM/app/" style="padding-top: 0px;"><img src="../img/logoSodiFrance-50x50.png"/></a>
      	
      </div>
      <div id="navbar" class="navbar-collapse collapse">
        <ul class="nav navbar-nav justify-content-center">
			<li><a href="/Suivi_CSM/app/"><span class="glyphicon glyphicon-home"></span>Accueil <span class="sr-only">(current)</span></a></li>
			<li class="dropdown">
	          	<a class="dropdown-toggle" data-toggle="dropdown" href="#"><span class="glyphicon glyphicon-cog "></span> Admin</a>
				<ul class="dropdown-menu">
					<li><a href="/Suivi_CSM/app/projets">Les projets</a></li>
					<li><a href="/Suivi_CSM/app/familles">Les Familles</a></li>
					<li><a href="/Suivi_CSM/app/collabs">Collaborateurs</a></li>
					<li><a href="/Suivi_CSM/app/activites">Activités</a></li>
				</ul>
			</li>
			<li><a href="/Suivi_CSM/app/saisieRF?day="+><span class="glyphicon glyphicon-tasks"></span>Saisies</a></li>
			<li class="dropdown">
				<a class="dropdown-toggle" data-toggle="dropdown" href="#"><span class="glyphicon glyphicon-list-alt "></span> Bilans</a>
				<ul class="dropdown-menu">
					<li><a href="/Suivi_CSM/app/bilanHebdo">Hebdomadaire</a></li>
				</ul>
			</li>
		</ul>
		<ul class="nav navbar-nav navbar-right">
			
			
				<li><a href="#">Richard</a></li>
				<li><a href="/Suivi_CSM/app/logout"><span class="glyphicon glyphicon-log-out"></span> Logout</a></li>
			
            	<li><a href="#"><span class="glyphicon glyphicon-question-sign"></span>Aide</a></li>
        </ul>
      </div><!--/.nav-collapse -->
    </div><!--/.container-fluid -->
  </nav>

Bilan Hebdomadaire :

`