When I try to log in to the site using the blue "Log in" button in home page I get error:
"Internal server error
Something went wrong.
Please email us about this error at wikipedialibrary@wikimedia.org or report it to us on Phabricator (?). "
The link there is https://wikipedialibrary.wmflabs.org/oauth/login/
If I use the "Log in" link in top-right corner, it succesfully logs me in. There the link is https://wikipedialibrary.wmflabs.org/oauth/login/?next=/