Thanks for the log. That specific error says that there's a typo in the data.
Code:
InnerException: System.Xml.XmlException: The 'currentFloor' start tag on line 1 position 3812964 does not match the end tag of 'currWalnutsentFloor'. Line 1, position 3812980.
It says "Walnuts"; right between code for 'currentFloor'. That, "Walnuts" should be removed from that section.
He can do it, or you can try via this guide:
https://stardewvalleywiki.com/Saves#Edit_a_save
Or you can post the save here, and I can help fix it.
Not sure if there's any other typos, as the game crashes & reports on the first one it finds.
But, fix this one first; then we can step through any new errors if they come up.