| InvalidDataType | fatal | |
| Data type in input image is not permitted | ||
| IncNumImg | fatal | |
| The number of images in sets is not equal to
the number of images in exposuresets | ||
| IncNumFlat | fatal | |
| The number of images in sets is not equal to
the number of temporary files in tmpflatsets | ||
| ErrFarith | fatal | |
| The FTOOLS task farith cannot be run in the process explained by the associated message | ||
| ErrFstruct | fatal | |
| The FTOOLS task fstruct cannot be run in the process explained by the associated message | ||
| ErrFkeypar | fatal | |
| The FTOOLS task fkeypar cannot be run in the process explained by the associated message | ||
| ErrIntmakehist | fatal | |
| Problem raised while trying to create histograms using module intmakehist | ||
| badDevice | fatal | |
| Specified PGPLOT device cannot be opened | ||
| MissingFitsKeyw | fatal | |
| The WCS keyword CDELT1 is not included in the input image | ||
| AllocationError | fatal | |
| Failed allocation for internal array | ||
| BadParamValue | fatal | |
| The requested bin size is smaller than one of the
input images pixel size, larger than one of the input image's size or it results in a binned image with only one pixel | ||
| NotImage | warning | |
| One of the input images is not an EPIC image | ||
| NotExpMap | warning | |
| One of the input exposure maps is not an EPIC exposure map | ||
| EmptyHistogram | warning | |
| All intensities in one or more of the bands are equal | ||