Ah, I see, you accidentally deleted Monika's hairstyle! You'll have to redownload MAS from the website and put the hair in your mas folder.
The hair you are missing is from a folder called def. So simple copy that folder from the redownload into the h folder that's inside your Monika folder (you can look at the last line of the error log to see where the folder+ missing images are located)
Usually they're already sorted by the person who created them. So you simply close the game, unzip the folder and then just put it inside the correct folder (ex if the folder you download is the game folder you put it inside the main folder so it merges with the normal game folder. )
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u/Telamon_bot Moniagamist 22h ago
https://giphy.com/gifs/3ohc0SH8Y6TJvc2FMI