Hi,
Unfortunately, we'd need more information about your setup. That error message is just saying that either your email address or password was incorrect. So, you may want to double check that your email is really "myemail" (which appears to be what you entered), and make sure you typed the password correctly.
As an example, if you call "create-administrator", you are prompted for an email and a password. If you enter the email "
te...@test.edu" and password "testing123", then you'd have to enter "
te...@test.edu" and "testing123" in the login form in order to authenticate.
If this doesn't help, then you may want to also check your other log files... maybe there's an second error in your Tomcat logs or Postgres logs which is resulting in this login failure. You also should verify that when you call "create-administrator", no errors appear in your dspace.log (if they do, then the administrative user is not being created successfully).
Let us know on this list if you have further questions.
Tim