Well, it looks like however you've set up your redirect/rewrite rules are breaking the Elgg rewrite rules. You could try with the simple rewrite rule on this page, debug your other rules, and then finish up the install: http://docs.elgg.org/wiki/Mod_rewrite_test
htaccess and I have created such a mistake Cash
The requested URL /kunden/homepages/37/d344360624/htdocs/modrewrite.php was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
how to get to work? if I write to handle the server?
This just shows that your problems have nothing to do with Elgg. Whatever you are doing to forward/rewrite requests from your base directory to your elgg directory are preventing any other rewrite rules from being processed properly. If you're not experienced with this I recommed either
1. moving Elgg into your root htdocs directory
or
2. setting up Apache so that is serves out of htdocs/elgg
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