[TYPO3-english] TYPO3 4.2.10 and RealURL 1.7.0

[Markus Deckmann]

Hi,

i have installed RealURL 1.7.0 on a TYPO3 4.2.10 und enabled 
autoconfiguration in the config-section in the extension manager. 
Furthermore I create a .htaccess file in root-directory of my website 
and add the following lines of code:

RewriteEngine On
RewriteRule ^typo3$ - [L]
RewriteRule ^typo3/.*$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l
RewriteRule .* index.php

If I go to my Root-Page the site is working and the links in the menu 
are replaced with /{Pagename}. If I click on one of this links a 
internal server error 500 is showing.

Can anybody help me to solve this problem and give me a hint which 
configuration I have forgot. Thanks a lot for your help.

Bye Markus