Postalcode WMS Link Down

Hi there,

for short, i cannot import the WMS from this tutorial:

The link:,plz_osm&

In JOSM doesn´t work with parser error and copied in a browser there is an 500 internal server error. Is the link correct?
I try to help for editing postalcode data in germany? Its my first import, i tried all: “add” buttons in JOSM → WMS/TMS.