Description
The Input Features parameter value was not projected to the coordinate system for the Candidate Features parameter value because the projections are incompatible. The analysis finished in the WGS_1984_Web_Mercator_Auxiliary_Sphere coordinate system.
Solution
To use a coordinate system other than WGS_1984_Web_Mercator_Auxiliary_Sphere, consider reprojecting both datasets into an alternative coordinate system that both inputs can successfully reproject.