[Problem]Failed to login please change your name

here is a picture :

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i had a server along time ago and i wanted to back so i put my files and open it but now i get this error , why is that ? whice client and patch are good ?
i'am using the 0.13.12 files and newmhlz1+newmhlz2
my os is windows 7 , Thanks alot .

Tried changing chars name ?

fixed..

#require close

#closed