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Why isn't Locate Features along Routes working?

Question asked by huffmanp on Apr 27, 2018
Latest reply on Apr 27, 2018 by huffmanp

I just had a guy come through my office in a big hurry, wanting to know how far apart along a river were some points in his GPS.  I've done this a lot so I can't figure out why it is not working today.  I downloaded the GPS points from his units, converted them into shape files in WGS 84,  threw together a map in ArcMap 10.6 with a basemap from ESRI so we would be confident in the points position.  Then I added a routed hydro layer,  made a selection of just one route , the main river, and added the selected route as a layer.  But when I run "Locate Features Along Routes"  I don't get an output table.  I just get an unhelpful ERROR 999999.  Why isn't this working?  Is it the coordinate system I have fallen into? Identify Route Location tool is working with my route layers.