"This acessory is not supported by this I phone"

Hello folks,

so I have a I phone 4 and I bought myself a dockingstation !

http://cmx.at/en/produkte/audio/ipod-iphone-docking-station/lsp-8300

It of course worked perfectly fine until I did the update for IOS 7. Since Yesterday I can not use my I phone on the station anymore. It can charge there but it always says " This acessory is not supported by this I phone". Yes I cleaned the plug in and I can not reset this dockingstation so what am I supposed to do?

Any ideas? No need to tell you how annoying this **** is !