#invalid data type all of the sudden

Hi! I've been using this sheet and formula for years now and haven't changed anything and all of the sudden it isn't working anymore and says invalid data type on every single cell that has a formula. Below is an example of a formula from the sheet for reference. I've never had any problems with it until today and I tried adjusting the formulas, column types, etc. and nothing works. Any suggestions are welcome!

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