I have a similar error
**** ProgrammingError("ERROR: type \xc2\xab geometry \xc2\xbb does not exist \nLINE 3: geom geometry(LINESTRING, 21781),\n ^\n",)
Process aborted! ******
The number 21781 is the projection (CH1903)
... but Postgis and Postgis topography are already installed
Could it be that this projection is unsupported by RiverGIS?
Thank in advance for help