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 {imap.gmail.com:993/imap/ssl}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.

Settings:

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