My Master Merchant is completely broken

[draworrun]

Hi all,
Suddenly my MM stopped working. I disabled all my addons and reinstalled MM but it would not help. The worst part I do not remember exactly when that error started popping out, but it seems to me it starts after the last major patch.


Also, I can't reset settings:


If I try to change any settings random errors start popping out:


Any help is higher appreciated, thanks in advance!