php - session_start() Error -

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i have problems session_start();

i know nothing should outputted before session_start(); statement

but can't find problem in script

index.php:

<?php session_start(); include('functions.php'); if(!is_logged_in(session_id())){     include('form.php'); }else{ ?> <html> <head> <title></title> </head> <body> </body> </html> <?php } ?>

but geh following error:

warning: session_start() [function.session-start]: cannot send session cookie - headers sent (output started @ c:\xampp\htdocs\fertige_scan\index.php:1) in c:\xampp\htdocs\fertige_scan\index.php on line 1

i hope can me :)

make sure file saved ansi format not utf-8 format.


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