I get this errors when going to the upload page

Warning: Call-time pass-by-reference has been deprecated; If you would like to pass it by reference, modify the declaration of exec(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. in /home/admin/xtremegamevideos.com/include/functions_upload.php on line 396

Warning: Call-time pass-by-reference has been deprecated; If you would like to pass it by reference, modify the declaration of exec(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. in /home/admin/xtremegamevideos.com/include/functions_upload.php on line 436