Hi Garvin,
thanks a lot for your reply. I've installed "php-services-weather " from the debian repository. I also tried to install the addon from the homepage, but the same error occours.
This is line 395 from Metar.php:
return Services_Weather::raiseError(SERVICES_WEATHER_ERROR_WRONG_SERVER_DATA, __FILE__, __LINE__);
I've just comment this line out and everything is working so far

, well exacpt from the icons.
Thanks

!