the default recipe doesn't work,
ODO
D D
ODO
nothing comes up when i try to craft it

you have to be on thr 1.6 version of the plugin

^

i am, i am using 1.6.3, also, i am using another plugin that adds a bunch of custom items, but i dont know if there is any texturepacks. will that conflict with the plugin? also, thanks for replying!

No, it will not conflict, also O is Obsidian and D is diamond block, just a heads up!