#15 Problem installing on a website

[Anonymous]

Fatal error: Uncaught SoapFault exception: [WSDL] SOAP-ERROR: Parsing WSDL: Couldn't load from 'http://rsolunas.de/production/backend/service.wsdl' : Premature end of data in tag html line 2 in /home/weboinfo/public_html/Flipbook/solunasAPI_bookflow/inc/list_free_rooms.php:34 Stack trace: #0 /home/weboinfo/public_html/Flipbook/solunasAPI_bookflow/inc/list_free_rooms.php(34): SoapClient->SoapClient('http://rsolunas...') #1 /home/weboinfo/public_html/Flipbook/solunasAPI_bookflow/index.php(28): include('/home/weboinfo/...') #2 {main} thrown in /home/weboinfo/public_html/Flipbook/solunasAPI_bookflow/inc/list_free_rooms.php on line 34

i dont know if im using the wrong php files or what the hell im doing wrong i have no clue how to install this but i need it urgently all help will be greatly appreciated