When reporting an issue, please try to reproduce the issue with just Dominos and Dominos_Config running. Dominos reuses a good chunk of the stock UI, and other popular addons, like Move Anything, like to take control of those parts, too.

There is no exp bar, i open the dominos options and bar config mode and there is no exp bar on the screen at all.

Addon Version
You can get this via running /dominos version in game
8.3.12-retail

World of Warcraft Version
For example, Classic, Retail, PTR, Beta.
Beta

Is Dominos_Progress enabled?

@Tuller I do not have dominos_progress. I cannot find it, how would i get it on Beta? This is all I have:

That would be the issue :)

Try reinstalling the addon.