[08:18] <guruprasad> Hi bmansurov, you encountered this issue because a Launchpad account was auto-created for your email address when importing bugs from external bugtrackers and Launchpad doesn't allow an email address to be associated with more than one account.
[08:19] <guruprasad> I have fixed this by merging this auto-created account with the account that you have created. So you should be able to log in now. Please let us know if you still encounter any issues.