WampServer

hey come on! i knew it my code is below: <?PHP include "emptyfile.php"; setcookie(......); ?> but it returns error of output before setcookie, why? emptyfile.php is like as : <??>
Forum: WampServer English

when i use include in my code it return one empty line and i can't use setcookie or other headers in my code please help me i installed vb but it return below error: Unable to add cookies, header already sent. File: C:\wamp\www\vBulletin\vb36\includes\config.php Line: 1
Forum: WampServer English