This is in the wrong section but I'll explain on how to fix it. Go to your cache and make a folder called "Raw". Next put the models for the items into that folder. Next go to client.java in your Client and search for "preloadmodels" if its commented out uncomment it. Next compile and run your client and when you spawn the items it should work. Also check server sided that you can spawn items greater than a specific one. You should look in Config.java and Commands.java server sided for that.