what is wrong with this output? please help!

<?php
//edit this array
//$contacts = array('Alena Holligan', 'Dave McFarland', 'Treasure Porth', 'Andrew Chalkley');
$contacts = array(
  array("name"=>"Alena Holligan","email"=>"alena.holligan@teamtreehouse.com"),
 array("name"=>"Dave McFarland","email"=>"dave.mcfarland@teamtreehouse.com"),
 array("name"=>"Treasure Porth","email"=>"treasure.porth@teamtreehouse.com"),
 array("name"=>"Andrew Chalkley","email"=>"andrew.chalkley@teamtreehouse.com")
);

//echo "<ul>\n";
//$contacts[0] will return 'Alena Holligan' in our simple array of names.
echo "<li>" . $contacts[0]['name'] . ":" . $contacts[0]['email'] . "</li>\n";
echo "<li>" . $contacts[1]['name'] . ":" . $contacts[1]['email'] . "</li>\n";
echo "<li>" . $contacts[2]['name'] . ":" . $contacts[2]['email'] . "</li>\n";
echo "<li>" . $contacts[3]['name'] . ":" . $contacts[3]['email'] . "</li>\n";
/*echo "<li>Dave McFarland : dave.mcfarland@teamtreehouse.com</li>\n";
echo "<li>Treasure Porth : treasure.porth@teamtreehouse.com</li>\n";
echo "<li>Andrew Chalkley : andrew.chalkley@teamtreehouse.com</li>\n";*/
//echo "</ul>\n";