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Because your save file is corrupted.
If you play v2.0.16 then you should have a backup save which you can rename to "Game.rxdata" and play from your last save on
Version 2.0.10 is out!
It contains a bug fix for auto save issues while battle and added event indicators for npcs after starting their quest.
A detailed description can be found here and in the changelog.
It should be the joiplay configuration.
If you configure/load the game in the joiplay app and enter settings like the path to the .exe, take for the asked game version 1.0.0, that works usually
I havent made the announcement yet and it took longer than I expected to impleme t some things, lets see if I dont need another week to show a little bit