Error "Name already in use"

Hello,
I have a problem when creating the character. (game it says "name already in use")
After searching and followed all the tutorials on this subject and formatted X times, the problem persists.
What should I do?

Thank you in advance for your help

(PS: Sorry for my english)

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In dem Beitrag von ihm ist das Problem doch gelöst oder?
Ansonsten
#closed