oUF Donut is purely a unit frame addon and wouldn't work as a replacement for
Lunar Sphere.
Ion, as an action bar replacement addon, is a
lot closer for a replacement for "Lunar Sphere". About the only things its' missing are the center orb and the "fly-out" that all buttons in "Lunar Sphere" have. The functionality that the center orb has could probably be replaced by
kgPanels with a little bit of work. The "fly-out" buttons are another matter, though. It could probably be done with
FlyoutButton Custom, but with the release of WoW 6.1, I don't know, and it
might not work with Ion.
Well, anyway, that's
my ideas. I don't know if that would work or not.
EDIT: @Tonyleila: I didn't realize you meant to use oUF Donut for the center orb. DOH!! I've
got to start reading, instead of "skimming" these posts.
/EDIT
EDIT 2: That error looks like it was caused by "ErrorMonster" and not by "LunarSphere". Try disabling "ErrorMonster" and installing
!BugGrabber and
BugSack. They use the Ace 3 libraries and are up-to-date. The Ace 2 libraries are not, as far as I know, and were abandoned about two years ago.
/EDIT 2