As reported on https://moodle.org/plugins/view.php?plugin=report_editdates version 2013081300 fails on Moodle 2.4 (all versions) with the following message: Fatal error: Call to undefined method MoodleQuickForm::setExpanded() in ..\report\editdates\form.php on line 66. I think setExpanded originated with MDL-30637 and was new to 2.5. Wrapping the two calls to setExpanded in a method_exists check resolves that error and the report appears to work fine otherwise.