From that traceback, the files in the "Family_trouble-0.9.12-pc/renpy" folder from that build don't match yours, they're from an older version of RenPy, they match the files from version 8.0.3 that I have so it should be around that. The problem is that specific config config.check_conflicting_properties
was only added in version 8.1 so it's not recognized as a config variable by that older build.
I'm not familiar with JoiPlay but if their github is accurate, their latest update to the /renpy folder was 3 years ago so my best guess is that's the culprit, it's trying to run your 8.2.3 game through an 8.0.x/7.5.x version of Ren'Py.
There's nothing wrong with your game in this situation and trying to add backwards compatibility for obsolete versions of Ren'Py will cause more problems than it will fix, your game relies on functionality that simply isn't available there and you won't even know where the problems are coming from.
My advice to players having this problem is to try the versions available here without using emulators and see if the problem persists, this is out of the dev's control otherwise (as even if this particular error was bypassed by removing line 15 of the gui.rpy there's no telling how many other issues would crop up next).
Edit:
I actually put your game into that 8.0.3 version of Ren'Py and got that same error. I can now confirm that bypassing that error will just give you a new one, don't try to fix it, it's just not compatible, it would be a mess.