NDR tool: Error when Summarizing the Results o Nutrient N
I'm using the nutrient delivery ratio tool and I have it running successfully now, but I was hoping to get an explanation as to why the tool wasn't initially working for me.
I've attached the error message from one of my earlier runs, and it looks like the tool got pretty far into its run. But, as you can see, it confronted an error when it was "Summarizing the results of nutrient n." I initially had a "ws_id" field in my watersheds shapefile, but when I removed it and then recreated it, the tool ran correctly. Has anyone had a similar problem? It appears to be working correctly now, but I'm still hoping to get an explanation as to why it wasn't initially working and/or why removing and recreating the "ws_id" column resolved my issue.