Ckeditor lost posting data

PHP Code:

<!-- CKEditor, you just need to include the plugin (see at the bottom of this page) and add the class 'ckeditor' to your textarea -->
<!-- More info can be found at http://ckeditor.com -->
<div class="form-group">
    <label class="col-md-2 control-label" for="textarea-ckeditor">CKEditor</label>
    <div class="col-md-10">
        <textarea id="textarea-ckeditor" name="textarea-ckeditor" class="ckeditor"></textarea>
        <div class="help-block"><code>.ckeditor</code></div>
    </div>
</div>


<!-- ckeditor.js, load it only in the page you would like to use CKEditor -->
<script src="js/ckeditor/ckeditor.js"></script> 


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