Some of the game's content files were modified or corrupted. This may cause game crashes, errors, or other issues."
It's best to reinstall the game, as many vanilla files appear to be broken.
You can also update SMAPI to version 4.2.1 and update 45 of your mods, but that's more of a side task.
I recommend reinstalling
Stardew Valley from
GOG, or getting it on Steam for easier file verification.