Troubleshooting Error 999999 in ArcMap and ArcGIS | CWS Help Website

help.watershed.ucdavis.edu

Set up your tool in ArcGIS, hit OK to run, and then... Error 999999 Unknown Error. The bane of the GIS analyst. In response to a number of questions I've gotten from students recently about this error, I wrote up a handy set of troubleshooting steps to take to resolve this error - already solved one persons problem! I'll probably even reference this myself next time I get the error.

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