Just Upgraded To Mv 4.10.1 And Get A Home Page Error

I'm basically trying to get help from the community for a an issue or
bug. i just upgraded to the Multi-Vendor 4.10.1.

However, when I add a product I get an error on the home page and it is
also shown as Service Unavailable. Please see screen shot.

When I change the products status to hidden I then see the home page
with no error. Prior to the upgrade all was working well. Would someone help me out please?

Thanks, Shlomo