SWY Error sometimes, success sometimes with same inputs

Hi,
I am having some issues with the Seasonal Water Yield model while using the the advanced Climate Zones option. I have attached 3 log files below. The first attempt failed after trying 5 times (1st log file), then I switch my ET0 and Precip inputs (incredibly similar, just different years) and have varying successful and failed attempts (2nd and 3rd log files, respectively).
2) Successful model - ET0 and Precip data from 2013
3) Error 'NoneType' object has no attribute 'SetProjection' - exact same inputs as the successful model, changed nothing and failed this time. This happened a few times.
Why is it that (a) the first attempt keeps failing? and (b) that the exact same inputs result in different outputs?
Thank you,
Alyssa
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