Cannot send session cache limiter - headers already sent

Hi I am new here. I am having a problem with a website I am changing. Everything worked fine untill I added a side bar. Now when the page loads it comes up with the following error:
“Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/england/public_html/en/PersonalityTest2.php:1) in /home/england/public_html/en/PersonalityTest2.php on line 1”

My page code is as follows. I have looked at it and looked at it but do not see where I am going wrong.

<?php session_start(); error_reporting(0); ?> PersonalityTest Page 2 <?php include_once("../analyticstracking.php") ?>
<?php include ("menu.php");?>
<?php include ("../sidebar/sidebar1.php");?>


Please choose the words in any column that most accurately describe you. To achive an accurate personality analysis it is very important that you look at yourself objectively and truthfully, and respond as others may see you.

<?php $_SESSION['first_name']=$_POST['first_name']; $_SESSION['last_name']=$_POST['last_name']; $_SESSION['email']=$_POST['email']; $_SESSION['country']=$_POST['country']; $_SESSION['ip']=getenv("REMOTE_ADDR"); //afisare ip si restu //------------------------------------------------------- $variante=array("Well Read","Polite","Knowledgeable","Compromising","Tolerant","Compassionate","Ethical / Moral","Routined","Logical","Liberal" ,"Extravagant","Emotional","Jealous","Self-Centered","Fashionable","Moody","Sociable","Romantic","Well Groomed","Sensitive" ,"Down To Earth","Selective","Creative","Adventurous"," Skillful","Unconventional","Independent","Health Conscious","Conservative","Casual" ,"Aggressive","Ambitious","Manipulative","Opportunistic","Friendly","Money Minded","Deal Maker","Informed","Community Minded","Dominant"); echo ''; echo '<form method="post" action="PersonalityTest2a.php"'; echo'
'; for ($i=0; $i < 10;$i++) { echo ''; echo ''; echo ''; echo ''; } echo ''; for ($i=0; $i < 10;$i++) { echo ''; echo ''; echo ''; echo ''; } echo ''; echo ''; echo '

Column A

Column B


Column C

Column D


'; //echo $_SESSION['first_name'].'
'; // echo $_SESSION['last_name'].'
'; // echo $_SESSION['email'].'
'; //echo $_SESSION['country'].'
'; // echo "ip: ".$_SESSION['ip'].'
'; ?>
  <!-- end #mainContent -->

<?php include ("footer.php"); ?>
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