1. Open file “wp-content\plugins\simplr-registration-form\simplr_reg_page.php”
2. find
require_once(SIMPLR_DIR.’/lib/messages.php’);
require_once(SIMPLR_DIR.’/lib/wp-session-manager/wp-session-manager.php’);
3. add code //
//require_once(SIMPLR_DIR.’/lib/messages.php’);
//require_once(SIMPLR_DIR.’/lib/wp-session-manager/wp-session-manager.php’);
4. save and exit
PS. I am sorry that I am not native English speaker.