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The extension doesn't work (gives fatal error) if PHP is compiled without multibyte string functions, specifically mb_convert_encoding.

Here's a patch.

In /includes/HtmlFormatter.php, in the root class, add:

/*
* Converts UTF-8 characters to HTML entities
* @param string $string: The string to convert
* @return string: The converted string
*/
public function convertToHtmlEntities( $string ) {
	if ( function_exists ( 'mb_convert_encoding' ) ) {
		return mb_convert_encoding( $string, 'HTML-ENTITIES', 'UTF-8' );
	}
	return htmlspecialchars_decode( utf8_decode( htmlentities( $string ) ) );
}

In getDoc function, replace
$html = mb_convert_encoding( $this->html, 'HTML-ENTITIES', "UTF-8" );
with
$html = $this->convertToHtmlEntities( $this->html );

And in fixLibXML, replace
$html = mb_convert_encoding( $html, 'UTF-8', 'HTML-ENTITIES' );
with
$html = $this->convertToHtmlEntities( $html );