Subset error in graph file using Geographic coordinates

We are trying to develop a graph file to take in multiple S1a images, subset them for a single location, then correct and process but are getting an error.

  1. ‘Read’ a S1a image in graph file.
  2. Add ‘Subset’ in graph file.
  3. Select ‘geographic coordinates’ option to specify what portion of the scene i want.
  4. Draw new ROI on map.
  5. Press ‘Update’.

gives the following error

“UpdateGeoRegion error reading wkt”

The image has not been geometrically corrected yet, so this is a possible cause of the geographic coordinates error, but SNAP should probably flag this?