geolocation error

Hi,

I have a startup workflow that executes the "Geolocate" viewer command. Occasionally it fails and I get the following error message: "There was an error projecting geolocation: output spatial reference is required." This only occurs in the workflow. When I click the "find me" button in the interface, it works fine.

The map service uses web mercator spatial reference.

Any thoughts on what may be causing this?