Using SMW 0.7 and PHP 5.2.4.  Installing eAccerator v0.9.5.2 as extension results in following error in Apache log:

PHP Fatal error:  Class 'ExtendedStatistics' not found in /usr/local/www/mediawiki/extensions/SemanticMediaWiki/specials/ExtendedStatistics/SMW_SpecialExtendedStatistics.php on line 15

Has anyone encountered this issue?

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Dan Thomas