ORA-13444: cannot perform mergeLayers operation

admin

ORA-13444: cannotperform mergeLayers operation
Cause: The two GeoRaster objects whose layers are to becombined together
either had different row or column dimension sizes, or their georeferencing
information did not match.
Action: Makesure the objects have the same row and column dimension sizes. If
neither is georeferenced, their ULTCoordinate values must be the same.
Otherwise, they must be both georeferenced and cover the same area in the model
space.