Well it turned out that it actually were in the right place, the items initialization class, but a register in it were messing with the class
But thanks for the help i didn't realize that it would check that class even after i commented out its use in the main class.
When i open the client or server it crashes with this error:
http://pastebin.com/YMjfHQuF
It still gives me this error after i've commented out my own code. It seems like it isn't my code that gives the error and i can't find the specified lines of code...
I've also tried re-installing forge but nothing seems to work
(I'm still a noob when it comes to programming but i do understand a bit.)