Im Receiving this Error After i Sign up a New Account

Hi I Have Successfully Sign up a New Account But after that i see it on the Page when the user has verified their account , it is throwing a message like this,

Warning: Creating default object from empty value in /home/rfnet/public_html/wp-includes/ms-settings.php on line 111

Warning: Cannot modify header information – headers already sent by (output started at /home/rfnet/public_html/wp-includes/ms-settings.php:111) in /home/rfnet/public_html/wp-content/plugins/sitewide-privacy-options/sitewide-privacy-options.php on line 560

Here is my settings :

Theme is WordPress 2013

Plugins Installed:



Domain Mapping plugin

Hello Dolly

Multisite Privacy

Password Protect Selected Content

Select Language At Signup


WPMU DEV Dashboard

Please advice how to remove that notice,

My Debug mode is False , so it shouldnt have that error showing after a new user activated a new account