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Possible Duplicate:
How to fix “Headers already sent” error in PHP
[Mon Jan 10 21:01:26 2011] [error] [client xx.xx.xxx.xx] PHP Warning: Cannot modify header information - headers already sent in Unknown on line 0, referer: www.example.com/some.php
Why PHP is not able to locate where the headers were sent from?
See if you have a space after
<?. The header function is quite sensitive and doesnt work if anything is outputted before hand.