[Plugin: Contact Form 7 to Database Extension] Error: headers already sent…

Hi

I have a problem showing data in a page using the codes. When adding the shortcode and pressing update I get this error message

Warning: Cannot modify header information – headers already sent in /home/acet-veeda/public_html/wp/wp-includes/pluggable.php on line 866

I am on WP 3.3.2 and Contact Form DB extension 2.3.2 and CF 7 3.2

Data are all stored to the DB.

Thanks, J.

http://wordpress.org/extend/plugins/contact-form-7-to-database-extension/