note 100232 added to function.header

i am getting the warning Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\projects\myproject\include\header.php:169) in C:\xampp\htdocs\projects\myproject\test.php on line 9 if someone can help me to fix this error send me the right code on my mail id hacker43.gaurav@gmail.com <?php session_start(); $sessid=$_SESSION['id']; include("include/header.php"); $sessid=$_SESSION['id']; if ($sessid=="") { header('Location:signin.php'); } ?> <tr> <td> <table border="0" height="985" width="100%" bgcolor="#FFFFFF"> <tr> <td > <table border="0" height="985" width="620" align="left"> <tr> <td valign="top"> <table border="2" width="620px" height="985px"> <tr> <td valign="top" style="font-size:18px; font-weight:bold; line-height:40px;" > <ol> <li><a href="phpdefination.php">PHP Defination</a> <ol> <li><a href="phpinstallation.php">PHP Installation</a></li> </ol> </li> <li><a href="echoandprint.php">Echo & Print</a></li> <li><a href="getandpost.php">Get & Post</a></li> <li><a href="strings.php">Strings</a></li> <li><a href="array.php">Array</a></li> <ol> <li><a href="numericarray.php">Numeric Array</a></li> <li><a href="associativearray.php">Associative Array</a></li> <li><a href="multidimensional.php">Multidimensional Array</a></li> </ol> <li><a href="functions.php">Function</a></li> <li><a href="forloop.php">For loop</a></li> <li><a href="whileloop.php">While Loop</a></li> <li><a href="ifelse.php">If Else</a></li> <li><a href="forms.php">Forms</a></li> </ol> </li> </td> </tr> </table> </td> </tr> </table> </td> <td valign="top" > <?php include("include/right.php"); ?> </td> </tr> </table> </td></tr> <?php include("include/footer.php"); ?> </td> </tr> </table> </body> </html> ---- Server IP: 59.162.86.8 Probable Submitter: 59.94.241.246 ---- Manual Page -- http://www.php.net/manual/en/function.header.php Edit -- https://master.php.net/note/edit/100232 Del: integrated -- https://master.php.net/note/delete/100232/integrated Del: useless -- https://master.php.net/note/delete/100232/useless Del: bad code -- https://master.php.net/note/delete/100232/bad+code Del: spam -- https://master.php.net/note/delete/100232/spam Del: non-english -- https://master.php.net/note/delete/100232/non-english Del: in docs -- https://master.php.net/note/delete/100232/in+docs Del: other reasons-- https://master.php.net/note/delete/100232 Reject -- https://master.php.net/note/reject/100232 Search -- https://master.php.net/manage/user-notes.php