DARN IT Updates ruined my site!!!!! Please help urgent!!

I clicked automatically upgrade on custom press and darn it now my site doesn’t work!!! I keep on getting this error: Warning: Cannot modify header information – headers already sent by (output started at /home/infinite/public_html/wp-content/plugins/custompress/core/content-types.php:1186) in /home/infinite/public_html/wp-includes/pluggable.php on line 866. This happens in the front end and in the back-end. Please help! THIS IS AN EMERGENCY AS THIS SITE WAS SET TO GO LIVE ON MONDAY!!!! The site is http://www.infinitenotarysolutions.com/

**EDIT** I fixed it by uploading an older version of the CustomPress plugin. This was a big pain!!!