Solved This character belongs to another player. [Windows]

[Puri]

Hi! Yesterday I played Stardew Valley with my friend, invited in Steam. Today when we start the Stardew valley, it download something. After it, my friend cant select his character, because it says 'This character belongs to another'.
What is the problem?

 

[Pathoschild]

Hi! The host player can enter this command in the chatbox:

/unlinkPlayer YourName

That will set the character as unclaimed, so your friend can reclaim it.