Error logging into site

Website hasnt been updated in a week and half due to some issue logging in, we tried to work with our host to fix it but to no avail thus far. So I thought Id turn to wordpress and see if someone might be able to help. When I try to access the dashboard this is the error message I get:

Warning: Cannot modify header information – headers already sent by (output started at /home/content/k/n/a/knathan82/html/wp-content/themes/ub_enormous 2/ub_enormous/functions.php:2) in /home/content/k/n/a/knathan82/html/wp-includes/pluggable.php on line 868