I just set up a multisite network and set up a new secondary site. The new site appears under the sites list but I cannot get to its dashboard. I get an "this is embarrassing page not found" error message and a page with unstyled content. From that page I cannot get to the dashboard, there is no WP menu bar, and no "Howdy username".
An earlier thread started to cover this (6 mos. ago) but the person gave up before the issue was resolved.
It was suggested that it could be a problem with the wp-config. I've checked my wp-config file and it has exactly the code shown in the codex for a sub-directory network. I'm on localhost and the primary site seems fine--I have full access. I am the super admin and no one else is accessing the network. I'm running MAMP on localhost if that gives any clues.
Judging from the previous thread, it seemed that others were having exactly this problem, but the solution was not identified. I'm stumped. Thanks for any help you can offer.