Plugin error message warning

I’m receiving the following error message when saving any posts or pages. Running latest version of Divi theme:

Warning: Cannot modify header information – headers already sent by (output started at /home/content/p3pnexwpnas03_data01/08/2410808/html/wp-content/plugins/ultimate-social-media-plus/libs/controllers/sfsi_socialhelper.php:319) in home/content/p3pnexwpnas03_data01/08/241808/html/wp-content/themes/Divi/includes/builder/functions.php on line 1831 and line 1833 also in functions.php and on line 197 in post.php and on line 1210 of pluggable php

Have deactivated plugin across several sites. Thanks for your help.