Are you over the user limit, or are all accounts you create unable to login at this point? Had a similar issue, but possibly not the same.
After installing i set a admin username/password, but could never login. I attempted "forgotten password", set a new password but still could not login. Due to your one-line error description, it's hard to judge if we were seeing the same issue. Please elaborate.
My problem was solved via:
Announced in this blog, this holiday season we’re celebrating all things CI/CD and between now and the end of 2019 we’ll be showcasing content, use cases, feature announcements and more. One featur...
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