Problem z mod rewrite Opcje

[cracksik]

w folderze ht mam plik .htaccess a w nim:

RewriteEngine On

RewriteRule ^ht/(.*)/(.*)/(.*)/ index.php?var1=$1&var2=$2&var3=$3

oraz index php a w nim:

<?php

$var1=$_GET['var1'];
$var2=$_GET['var2'];
$var3=$_GET['var3'];

echo $var1.' '.$var2.' '.$var3.' ';

?>

do przegladarki wpisuję:

http://localhost/ht/jeden/dwa/trzy/

i dostaję:

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, admin@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

mimo tego, że WampServer mam cały czas uruchomiony

co robię źle ?