I'm building a web application, and I'm currently working on the account registration code, and I could use some design advice. In your opinion, is it better to say "username/email address in use" when one or both are in use, or would it be best to specify whether the username or email address are in use? Why?

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    The second one (if you have different input fields for them), otherwise the first (if you have 1 single input for both email or nickname). As a user, I will be annoyed to not understand which one of the two inputs is incorrect.
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