HelpRotmg Private Server Adding Items Crash

Okay so I use the Club559 source for my pserver and I use sharpdevelop to edit items and stuff. I have always been able to edit items and like change stats but I can not seem to add more items. I watched guides on youtube and I am doing everything right but when I get everything in I try to run server.exe and wserver.exe and the stop responding and crash every time. But then when I delete the item it works again :| Please help

Error please?

edit:
Also the Item the keeps crashing the server.exe please give the code for the item.

I believe it is the object id...

probably using the same one as another one.

Probably this, if not.. Post some fucking errors, is it really that hard? @TherestOfThisSection