Support System Settings

When I setup Support System Settings, I am getting this header error:

Warning: imap_open() [function.imap-open]: Couldn't open stream {}Inbox in /home/maxweb/public_html/wp-content/plugins/incsub-support/incsub-support.php on line 2928

Warning: Cannot modify header information - headers already sent by (output started at /home/maxweb/public_html/wp-content/plugins/incsub-support/incsub-support.php:2928) in /home/maxweb/public_html/wp-includes/pluggable.php on line 876

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/maxweb/public_html/wp-content/plugins/incsub-support/incsub-support.php:2928) in /home/maxweb/public_html/wp-content/plugins/whmcs-wordpresss-integration/whmcs-integration.php on line 205

We would like to use the fetch option. We are using Google Apps.


Fetch Responses ENABLED
Fetch Responses via imap HOURLY
IMAP details
IMAP server port 993
SSL yes
IMAP inbox Inbox
User name full email address
Pass is the account pass