Puzzling error using HKWorkoutRouteBuilder

When I insert route data into HKWorkoutRouteBuilder I get the following error:

The connection to service named com.apple.healthd.server was interrupted, but the message was sent over an additional proxy and therefore this proxy has become invalid

Here's a code snippet.

        workoutRouteBuilder.insertRouteData(filteredLocations) { (success, error) in
            if !success {
                print("inserting route data failed with error: \(String(describing: error))")
            }
        }

I patterned by impelementation from the Speed Sloth example.

Any insights would be appreciated!