the error means that there is output on the page that is causing the header() function to fail on redirecting.
according to the error, the problem is happening at line 1 of the contact.php:
output started at /home5/richwsco/public_html/ym/nova/contact.php:1
either there is output before the first opening php tag on your page, or the BOM Signature is enabled for your page.
see this thread for more details: