Custom Items not working

So. I came back to run my private server after 1 month. Works fine. Decided to get the images of the new oryx items, and put them in the client. I did everything correctly inside of MS C#. Did it just like I always do, and those work. This does not interfere with the server or wserver or rebuilding. Everything works fine, I even tried adding something else that had remote textures, those didnt work either. The Object Type does not interfere with anything else, and I am rebuilding. When I go in game though, and I do (for ex): /give harlequin armor - it just says unkown object type! almost like you are doing like /give sadhgdad - and it would come up as unkown object type, like it doesn't exist. Same happens with new enemies.