Anonymous Item that "Will no survive a 1.7 upgrade"

[DanilaFE]

2013-12-08 18:27:14 [sEVERE] [ForgeModLoader] Found anonymous item of class path.to.package with ID 1163 owned by mod Modname, this item will NOT survive a 1.7 upgrade!

 

I get this message for every single item in my mod. While launching from Eclipse. Can someone explain this to me?

[larsgerrits]

It means that a item uses methods that will be removed in the 1.7 update

[DanilaFE]

I did, I’m not that stupid.

[LexManos]

Name your item the same way you use resource locations:

mod_name:item_name