Why is this marked as an accepted answer, when the post doesn't give any answer.

me too have exact issue.. OS Catalina. have tried to reinstall using internet recovery , but the error still continues. reset fusiin and reinstall, stil the same issue. initiall those 'nt mapping' errors were few, login didn't effect... but then slowly the number of entries have increased, so now login takes 1hr or so, with beachball .. any action after login just a click takes another 30mins or so with beachball. cannot work at at. Is any Apple developer around to look and let us know surely it should be easy peasy to say what the code is referring to and what it is complaining about. without source code, it is really hard to say what is happenning. or atleast inform what to look for and where. Thanks.