World crashes upon opening

Beginning 2 up-dates ago (approx. Oct 1/21) a world I had been working in for over a year crashed and cannot be re-opened since. It will load, open, and then crash within about 10-15 seconds of being fully loaded to the screen. Heartbreak! 

This problem began IMMEDIATELY after the up-date was loaded to my Switch!!

I get the message "This file was closed due to an error". 
Please advise.