WP backend login error "Warning: Cannot modify header information"

Warning: Cannot modify header information - headers already sent by (output started at /home/cpaneluser/public_html/wp-content/plugins/wordpress-facebook-integrate/wp-fbi-core.php:28) in /home/cpaneluser/public_html/wp-includes/pluggable.php on line 890

This problem is solved by deleting the plugin that caused.
In the case of the above code, deleting the folder and all the content will fine well. public_html/wp-content/plugins/wordpress-facebook-integrate