Is there some way to reset an Addon?

[Cohacq]

I did something to my Luna Unitframes and now I get an error message that wont go away and typing /luna doesn't do anything. How do I reset an addon without removing ALL my settings?

[Roadblock]

Without knowing the exact error that's impossible to answer.
There is no generic way to reset some settings while keeping others for a single addon.

If you mean you want to reset Luf to defaults but not your other addons that's simpler.

1. Exit the game completely
2. Use Windows File Explorer to go to <wow_install>\WTF\
3. Ctrl + F or F3 and type Luna and search, it should return LunaUnitFrames.lua / .lua.bak
4. Rename both files putting something infront of the name (eg backup_LunaUnitFrames.lua)
5. Start the game.

LunaUnitFrames will have reverted to fresh install, your other addons won't be affected.