None, never seen it before, never heard anyone complain about it. Try just deleting the prefix and installing it again, perhaps it has to do with the problem with Blizzard app and random config file corruption.
It gets me nothing… o.O (Edit: Didn’t close lutris before the cmd. Trying again)
But here is two pictures:
I’m able to select language: https://prnt.sc/kophcs
Then it’s updating something (didn’t get a picture of that)
And finally his error: https://prnt.sc/kophcs