Multisite privacy gravity forms clash


In my multisite I need to use both multisite privacy and gravity forms. However when I am activating the privacy plugin, I have problems with Gravity forms. I have the warning below in Gravity forms section. It disappears when I deactivate privacy plugin.
How can I solve this?


Warning: Cannot modify header information - headers already sent by (output started at ..../public_html/wp-content/plugins/gravityforms/tooltips.php:319) in /home/..../public_html/wp-content/plugins/sitewide-privacy-options/sitewide-privacy-options.php on line 497