000981 : The <value> conceptualization of spatial relationships is inappropriate for data measured in a Geographic Coordinate System.

Description

For accurate distance measurements, you should always project your data prior to analysis. The option you've selected for the Conceptualization of Spatial Relationships is invalid for data measured in a Geographic Coordinate system.

Solution

Project your data to a Projected Coordinate System and rerun the analysis. Alternatively, set the output coordinate system to project your data on the fly.