title: tinymce editor is not displaying and getcontent returns false
body: <p>This is the path of tinymce:</p>
  
  <pre><code>&lt;script type="text/javascript" src="demo/tinymce/js/tinymce/tinymce.js"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>My text area is :</p>
  
  <pre><code>    &lt;textarea name="description" id="description" class="texarea" &gt;
  </code></pre>
  
  <p>this is my TinyMCE init code:</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
   tinymce.init({
   selector: "texarea",theme: "modern",width: 680,height: 300,
      plugins: [
           "advlist autolink link image lists charmap print preview hr anchor pagebreak",
           "searchreplace wordcount visualblocks visualchars insertdatetime media nonbreaking",
           "table contextmenu directionality emoticons paste textcolor ResponsiveFilemanager"
     ],
     toolbar1: "undo redo | bold italic underline | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | styleselect",
     toolbar2: "| ResponsiveFilemanager | link unlink anchor | image media | forecolor backcolor  | print preview code ",
     image_advtab: true ,
  
   external_filemanager_path:"ResponsiveFilemanager/filemanager/",
   filemanager_title:"Responsive Filemanager" ,
  
   });
  &lt;/script&gt;
  </code></pre>
  
  <p>The problem is the text area is not showing the editor and </p>
  
  <pre><code>tinyMCE.get('description').getContent()
  </code></pre>
  
  <p>return  error "Uncaught TypeError: Cannot read property 'getContent' of null". Please help me to find the error in this code. Thanks in advance. </p>