crashing in game

Hi, My friend and I wanted to play stardew valley and I suggested we'd play on an older file of mine. I'm not sure if this one has been modded but i'm confident we've played a long time without mods. This has never happened before and I looked on google for several solutions, none of them have...

A myriad of issues occurring while trying to play local co-op on the Nintendo Switch. … Sometimes, the hosting game cant be found. … Sometimes, the joining game randomly crashes because "A software error has occurred". … Sometimes, the game crashes while trying to join a hosted game. …...