I activated the WHMCS WP integration plugin. I added the short code [wcp_content] into a sample page.
You can find it out at: http://hub.co/?page_id=2
When I call the page, i see the following:
Warning: Cannot modify header information - headers already sent by (output started at /home/hub/public_html/wp-content/themes/twentyten/header.php:12) in /home/hub/public_html/wp-includes/pluggable.php on line 899
I tried this with TwentyThirteen, TwentyTwelve, TwentyEleven, TwentyTen themes. But, all show the same error/ warning.
I spoke to "Ashok" at live chat session and he asked me to disable all plugins and try activating each one. As of now, only WHMCS WP integration is the only plugin which is active.
I tried accessing the site in various browsers, IE 10 and FF 24. Still nothing.
Please advise how to get this error resolved.