Unable to generate a URL for the named route "admin_addons_login" as such route does not exist.

[HemaShop]

var/cache/ was deleted multiple times error still apeared
I upgraded manually to Version 8 and not it's bugged need help

 

[Robert]

Hi.

AFAIK, the modules responsible for the above error are: psaddonsconnect and (if excluding the first one doesn't solve the problem)- ps_mbo (both in /modules folder).
I'd suggest You making a copy of both modules, , delete each one, clearing the cache folder manually (var/cache) and you'll be able to login to the backoffice (unless there are further errors unrelated to the above issue).

This issue is addressed on GitHub:
Unable to generate a URL for the named route "admin_addons_login" #30979

Good luck...

Edited January 30, 2023 by Robert (see edit history)