Please help with PHP error.

I know nothing about PHP and I don't know if anyone here can help, but I thought it was worth a try since I think this error is preventing the search bots from accessing my forum. This is a mod to phpbb3.

I get this error whenever I login and only when I log in:

[phpBB Debug] PHP Notice: in file /includes/functions_seo.php on line 269: Cannot modify header information - headers already sent by (output started at /cache/tpl_Iconic_Green_overall_header.html.php:3)
[phpBB Debug] PHP Notice: in file /includes/functions_seo.php on line 270: Cannot modify header information - headers already sent by (output started at /cache/tpl_Iconic_Green_overall_header.html.php:3)

Is there any information like the source code I can post here to help?

 

the script is not properly buffering the html or header output.

 

This error is caused quite often by html in the script before the session start() tag which must come before any html.

It is just a matter of tracking down the offending script and moving the tag to the top of the page.

I doubt it is affesting SE.

 

Yea, I finally found it after 3 days. It was a tag in the wrong place.

Google says it cannot access my home page for unknown reasons and they have not successfully accessed my home page since the 13th. I did fix this problem and an xml parsing error showing through w3c validator.

I sure hope one or both of things was causing the problem with google bot, because I have no idea what else it could be. I need to get indexed.

Anyway, thanks for your advice.

 

put ob_start(); at the begining of the script and ob_end_flush(); at the end.