PHP Warning

Hey,

Im trying to initiate php script, on the beginning it was working but suddenly stopped.

In my debug file I see this error:
PHP Warning: Declaration of TaskScheduler_AdminPage_EditModule__Section__Occurrence::validate() should be compatible with TaskScheduler_AdminPage_Section_Base::validate($aInput, $aOldInput, $oAdminPage, $aSubmitInfo) in /srv/users/USERNAME/apps/APPNAME/public/wp-content/plugins/task-scheduler/include/class/admin/page/edit_module/section/TaskScheduler_AdminPage_EditModule__Section__Occurrence.php on line 19

Can help with this issue?

The page I need help with: [log in to see the link]