Hi Sean, this is a problem in QGis which doesn't support Type = "Geometry" in PostGis. I've the same problem using Titan, maybe it's different in latest release ?
To fix the problem, you need to define in sPostgisOutput component the geometry type (ie. Point, LineString, Polygon, Multi*...) according to your input geometries and not use the generic Geomtry type if you plan to use Qgis.
PS : type = "Geometry" is well supported by uDig.