HELP! Game crashes before the day house is upgraded (addition:cellar).

Message: Error loading "Maps\FarmHouse4". File not found.

Should you consider lending a hand I'll upload the games files you need.

Description:
I'm on the 22nd of Spring and it is the last day for the house upgrade (addition of cellar) according to Robin. I went to sleep, had the notification it saved but then the game crashes immediately after that. A window pops up saying 'Stardew Valley has stopped working". I reopened the game but whenever I load my saved game, it will loop to the opening/loading screen of Stardew.

I really do hope you'll help me. Please. It'll be the best Christmas present. :'((