HTML Code displayed in text editor

Hello,

I am using TinyMCE as text editor for admin panel in my codeigniter website.
But, it is show the html code in edit mode like this :

Code:

<p>Suspendisse ac enim nisl. Suspendisse varius lorem sit amet neque aliquam, ut blandit justo finibus. Nam tempor sagittis dolor, non condimentum elit euismod sed. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Integer mollis varius volutpat.</p>

It should be not displaying the html code.

What I have to do to fix this problem ?

Thank you.