Help this error

[yjy1175]

After starting my login server, entering the game through the launcher, and looking at the login server log, "Error - not found user" is displayed and the process does not proceed. Why does this log keep appearing? Please Help me!!!After starting my login server, entering the game through the launcher, and looking at the login server log, "Error - not found user" is displayed and the process does not proceed. Why are you doing this? Everything went well according to the tutorial. please help