Thread:Extension talk:S5SlideShow/Call to a member function getHeadItems() on a non-object/reply (5)

I got the latest (50ed226ab9) version of extension and it still does not work: Fatal error: Call to a member function getHeadItems on a non-object in /proj/webdocs/wcdma-wrat/root/w/extensions/S5SlideShow/S5SlideShow.class.php on line 371

The example of presentation:
 * title: My Title
 * author: Me

Slide 1

 * Text 1.1
 * Text 1.2

Slide 2

 * Text 2.1
 * Text 2.2

The extension installed in the following way: // headingmark attribute default value $egS5SlideHeadingMark = ''; // incmark attribute default value $egS5SlideIncMark = '(step)'; require_once( "$IP/extensions/S5SlideShow/S5SlideShow.php" );
 * 1) Slides

Versions: MediaWiki 1.20.2, PHP 5.3.21 (apache2handler)

In case if other installed extensions interfere, there are: Collection 1.6.1, Contribution Scores 1.16, External Links 1.1.1, Interwiki 2.2 20120425, Cite (f1b22c4), DynamicPageList 1.6, Graphviz 0.9.1 alpha, ImageMap (da17766), InputBox 0.1.4, MyVariables 3.1.1, ParserFunctions 1.4.1, pChart4mw 1.4.0, SyntaxHighlight 1.0.8.11, UML 0.4, SphinxSearch  0.8.5, Vector 0.3.0, WikiEditor 0.3.1.