Thread:Extension talk:MultiUpload/MW 1.22 Fatal Error

Extension doesn't work with MW 1.20. Get a PHP Fatal Error if I call the special page: Fatal error: Cannot make non static method SpecialUpload::getDupeWarning static in class MultipleUpload in extensions/MultiUpload/MultiUpload.body.php on line 0, and when I call upload file Fatal error: Cannot make non static method SpecialUpload::getDupeWarning static in class MultipleUpload in extensions/MultiUpload/MultiUpload.body.php on line 10