can you remember what you were doing at the time this error message occurred. It doesn't seem to be an on login error as I know I haven't got that error.
It sounds like from the message that you were in the middle of combat when nUI tried to hide the bars.
Hiding and showing bars during combat isn't allowed so it would be good to see what you were doing at the time in case there's a missing check for in combat status somewhere.
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