Appointments + Error

I get this error and can't get it to sync with google.

Warning: Cannot modify header information - headers already sent by (output started at /hermes/bosoraweb079/b1517/ipg.ohionutritioncom/wp-admin/includes/template.php:1642) in /hermes/bosoraweb079/b1517/ipg.ohionutritioncom/wp-includes/pluggable.php on line 876

I've changed settings in those files to 777.

Help please :slight_smile: