Oh the joys of having and running your own website. Have you searched for " wordpress Gutenberg Update Errors? Doesn't wordpress have a community forum?--I would start there, is wordpress hosting your site? What theme are you using?
I just updated my wordpress site but haven't seen any errors as of yet.
To get it fixed, post your problem/request at peopleperhour.com go thru the offers to fix the problem. Payment is made thru paypal or go to justanswers.com and post your problem there and pay for the fix.
Have you asked your hosting company for help with this issue?