error 404 management system menu cannot be accessed

Accepted answer

The HTTP error 404, or more commonly called "404 error", means that the page you are trying to open could not be found on the server.

For more details:

Please check below link:

https://www.prestashop.com/en/blog/404-not-found-error-how-to-fix-it

i just restarted the app and it works now thank you

404 in the sense not found , what ever you are looking that is not exist .

please cross check the adress , any speling issue etc ....