EarlyLoadingException: duplicate mods found

[DiademDracon]

I've been working with some friends to try and get a homebrew modpack working for the past few hours, and we've finally narrowed it down to Essential wanting FML33(not the primary topic), and a duplicated mod that we can't seem to locate.

Crashlog here: https://pastebin.com/9CVF8FFj

[TileEntity]

Remove Rubidium - you are already using Embeddium, which is a fork of Rubidium