Thread:Semantic-mediawiki.org:Community portal/The type of this property is invalid

Hi, SMW works awesome for me so far. But I got a little trouble. I wanted to assign some coordinates to a location. Thus I gave the property "Has coordinates" the type "Geographic Coordinates". But when I use this property and type onto a page i.e. Has coordinates:: -32.715° -77.03201° there is a little exlamation mark symbol. When I hover over the symbol it says: "Error - The type of this property is invalid". What am I doing wrong here?

Thanks for your help!