Hi @Jyothi and welcome to the community.
You mentioned that you signed up in Bitbucket, so I assume you mean Bitbucket Cloud, https://bitbucket.org/ ? Could you please confirm?
Do you get this error when logging in to the website? Log in to the website is possible with email+password only (so not with username). The username is only used locally when you try to clone/pull/push to a repo.
If you're still facing issues, please let us know whether you're indeed using Bitbucket Cloud and where exactly you see this error (a screenshot would be helpful) so we can better help you.
Kind regards,
Theodora
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