I was wondering what this error below means that I got when trying to generate a watershed from a set of points cropped to a polygon. I think the problem might be in the resampling size. This error was generated when I used 5x5 or less resampling size, but when I expanded it to a 9x9 resampling, I didn't get the error. I have two DEMs, ETOPO1 (ETOPO1 Global Relief | ngdc.noaa.gov) and a 500m resampling of the SRTM data and the error only occurs when I layer the SRTM on top of the ETOPO DEM.

Please help.

I didn't find the right solution from the Internet.

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