Hi @kblann, Based on the error, it looks like your landcover raster has some pixel values of 128, and the value of 128 isn’t in your Curve Number table (curvenumber.csv). This sometimes happens with signed byte rasters in ArcGIS, or else it’s possible that the nodata value of the raster is not set. Could you check that the nodata value is set to the correct pixel value?
Let us know if that doesn’t do the trick and we can keep troubleshooting!
James