Cannot moderfy headers!!!!

[peterwilding]

hi im an absolute noobie and i have limited knowledge
I have uploaded a new template by vn2 - and a payment module and shipping module
Now when a customer creates an account when they enter details and press continue it says Warning - headers already sent by (output started at /home/xgear/public_html/includes/application_top.php:510) in /home/Xgear/public


help!!!!!!!!!! i am using the default oscommerce stuffs other then the template and 2 modules
I have no idea what this is

i know this is on www.oscommerce.info but i dont uderstand it and it doesnt help
Thanks
Pedro

[Jonnyboy]

Check for blank spaces at the end of the application_top.php file.
Some editors put blank spaces after the closing php tag.

Hope this helps
John