Need help with adding new items in...

Hey guys,
i have a big problem.
if i try to make new items, there is a error ingame: Unknow Type...

I added a Sprite picture:



I rebuilded it too...
Addition.xml is edited and now i dont now what to do...

Edit:
I cant make maps too, Unknow Type too, when i try to give a key lololol

You did something wrong. Follow my tutorial, and don't make any mistakes....
http://www.mpgh.net/forum/720-realm-...tom-items.html

I'm having this problem too, and I still down understand

Got it to work later on.

The problem is fairly easy to understand. The sprite has to be of the same size of the others in the files, and has to be aligned.