How would I obtain error information on a $Failed GeoElevationData?

The following code returns an error: GeoElevationData: with no description of the error. I think this error may be because I am asking for elevation data that is too granular.

cellGrid= Flatten[Table[{lat,lon}, {lat, 53.506, 53.508,0.0005},{lon,-112.097, -112.095,0.0005}],1] elevationData = GeoElevationData[cellGrid] 

When I look at the stack trace, I see an ...Throw[$ Failed, "GeoElevationDataError". There are no entries in Help for the GeoElevationDataError.

I will try a variation on this code, but, are there some good detailed sources for error information?