[PHP] session trouble

[empty]

hi guys ;

 I can't use session bla..as on my site.
PHP Code
<?php
session_register();
if(isset($username) && isset($pass)){
        if(login($username,$pass)){
                $valid_user=$username;
                session_start("valid_user");
                do_html_url("/","Ana Sayfa");
                
        }else{
                echo("Teknik bir sorun nedeniyle giriş işleminiz gerçekleştirilemiyor. 
Lütfen Daha sonra tekrar deneyiniz3.");
        }
}
else{
 ?>
...
 
Warning: Cannot send session cache limiter - headers already sent (output started at 
D:\sites\inc\register.inc:23) in D:\sites\uyelik\login.php on line 90

I cant understand and solve the warning message, what is it?

thanks all.


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