Admin Login page not loading

Hello,

When I enter the URL http://www.mysite.com/wp-admin for some reason the log in page will no longer load. Instead a message appears showing:

Warning: Cannot modify header information – headers already sent by (output started at /home/lauroochcp/public_html/goweb-inc.com/wp-content/plugins/js_composer/include/autoload/vendors/gravity_forms.php:1) in /home/lauroochcp/public_html/goweb-inc.com/wp-includes/pluggable.php on line 1167

Because of this I can not log in the admin side of my site and cannot edit it. Can anyone help with this issue?