Undefined variable error on page

I’m getting the following error when I try to present a slideshow:

Notice: Undefined index: HTML5presentation_edit in d:\Wampserver\…\html5slideshowpresentations\html5-presentation-template.php on line 90.

WP is running in multisite mode. Anything you could do to help with this would be greatly appreciated.

http://ww.wp.xz.cn/extend/plugins/html5-slideshow-presentations/