Issue with wp-admin

I was logging in FINE… no problem.. now I’m getting this error at the login link, and I can’t access the admin of the site…

Warning: Cannot modify header information – headers already sent by (output started at /home/content/v/i/b/vibrantinergy/html/wordpress1/wordpress/wp-config.php:153) in /home/content/v/i/b/vibrantinergy/html/wordpress1/wordpress/wp-includes/pluggable.php on line 850