Hi,
I used:
phpBB_SEO-3.0.10 - Advanced - 0.7.0

I got this bug report.

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[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4920: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3876)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4921: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3876)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4922: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3876)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4923: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3876)

/includes/functions.php on line 4920-4921-4922-4923:

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   header('Content-type: text/html; charset=UTF-8');
   header('Cache-Control: private, no-cache="set-cookie"');
   header('Expires: 0');
   header('Pragma: no-cache');
   //Begin: Profile Fields Control MOD


and
/includes/functions.php:3876:

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            echo '<b>[phpBB Debug] ' . $error_name . '</b>: in file <b>' . $errfile . '</b> on line <b>' . $errline . '</b>: <b>' . $msg_text . '</b><br />' . "\n";


Thank you for answers and help

Long answer: The "echo" begins the generation of the body of HTML; once that's started, you can't add to the header. That's because generating the first line of the body implicitly invokes the immediate generation of the header content. You should rework your code such that the header content is defined before generating the body.

Short answer: It's just debug output. Do you have debugging enabled in config.php? If so, turn it off in production.

Thank you for replay.

I understand. you're right. I changed the config file in this way;

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@define('PHPBB_INSTALLED', true);
@define('DEBUG', true);
@define('DEBUG_EXTRA', true);

Because; I installed "debug_errors_and_notices_v1.2.0".

I thought the overall error.Understood that the file has been changing.

Sorry for my bad english.Thank you for taking the time