Need help with FeedAPI

Hello

i need some help with the FeedAPI module and this feed:
http://www.pr-gateway.de/export/fair-news/export.php

I want to import this feed to my drupal site. But i doesn´t work. When i create a feednode and add this feed i get this message from drupal:

Could not refresh feed.

My installed FeedAPI modules are the following:
FeedAPI
FeedAPI Mapper
FeedAPI Node
FeedAPI Imagegrabber and
SimplePie Parser

Can anyone help me?