Thread:Extension talk:WYSIWYG/Issue "undefined index: 'rich load semantic toolbar' in \WYSIWYG\CKeditor.body.php on line 435"

Hi, I'm using MW 1.16.5 and WYSIWYG 1.6.0 and after installing WYSIWYG extension I have this PHP error report : "undefined index: 'rich_load_semantic_toolbar' in \WYSIWYG\CKeditor.body.php on line 435" when I load the modification page. Why? The WYSIWYG extension is well installed.