Oracle Message ORA-13456 - GeoRaster cell data error: string

ERRORGeoRaster cell data error: string
CAUSEThere was an error in the original GeoRaster cell data or in the cell data of the pyramids.
ACTIONIf the error is related to the original GeoRaster cell data, the GeoRaster object is invalid and has to be deleted or manually repaired. If the error is related to pyramids, delete the pyramids and regenerate them.