That is the problem either upgrade to at least 4.3.0 or run this script and it should work with your version.
page1.php
<?php
session_start();
session_register('session_var');
?>
<html>
<head>Testing Session Variables</head><body>
<?php
$session_var = "Another test of session variables.
echo "This is a test of the session variables
<form action='sessionTest2.php' method='post'>
<input type='test' name='form_var' value='testing'>
<input type='submit' value='Goto next page'>
</form>";
?>
</body>
</html>
sessionTest2.php
<?php
session_start();
?>
<html>
<head><title>Testing Sessions Page 2</title></head>
</body>
<?php
echo'"session_var = $session_var<br />\n";
echo"form_var = $form_var";
?>
</body>
</html>
