SWY Error sometimes, success sometimes with same inputs
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).
1) Error 'NoneType' object has no attribute 'SetProjection' - failed 5 times using ET0 and Precip data from 2010
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?