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You are trying to register a new account with a name already in use "suiko2fan".
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You entered an address which does not correspond to the account "suiko2fan". I just checked and the user "suiko2fan2" uses a different mail address for that account.
Most likely you run into the problem I was talking about. If that is the case, then you don't remember the mail address used for registration (or you don't have access to it).