This looks like a conflict error... I'm in nUI now and have been testing for hours. I am aware of a problem with the new code changes to "nUI_UnitRole.lua" which may be responsible for the portrait problem you're having, but it would not be responsible for the error you are reporting.
Can you do me a favor and try loading nUI with none of your other mods enabled and see if it still fails with that error?
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