Gives fatal error when i try to export question

Hi,
When i try to export question in any export format it gives me error.

Fatal error: require_once() [function.require]: Failed opening required 'sites/all/modules/quiz/includes/moodle/question/format/qti2/format.php' (include_path='.;C:\php5\pear') in C:\wamp\www\demo\sites\all\modules\quiz_ei\questions_export\questions_export.admin.inc on line 279