First line is probably a mistyped password when accessing the admin interface.
Second and third are about song properties that iTunes asks, but Firefly doesn’t know about. They’re not essential and you wouldn’t know any difference if they were there.
Oh sorry, didn’t know you put those into the log as well, I ignore this expected ones usually on default debug level because of exactly those questions (users don’t know about protocol details 😉 ) 😀