open EMenu.php file in extensions/menu you will find the file has short tags <?, change it to <?php instead. I had the same problem and took me so long to figure out.
I now have an issue with publishing the assets. The aurthor has not updated the extension to work with the latest version of yii so its just not working.
Nice extension but im facing problem while modifying the css and while modifying the length and width of the menu. Please tell me any one, that how to do this?