Error after instaling

Hi after i followed the steps to install the CKEditor 3.2 i received this message at my webpage:
Fatal error: Call to undefined method: ckeditor->textarea() in /homepages/4/d249914843/htdocs/canalcomercio.tv/tecnica/teste/cadastro/cadnot.php on line 81

the code is:

<?php
      include("../ckeditor/ckeditor.php");
      $CKEditor = new CKEditor();
       echo $CKEditor->textarea("texto", "<p>Escreva seu texto aqui.</p>"); 
   ?>

what's wrong?