| Binning | error |
| | Source and Background Lightcurve not aligned. |
| ZeroBackscale | error |
| | Source or Background backscale 0. |
| NoCCDID | error |
| | No CCDID keyword found in GTI table. The user has to recreate the eventlist, srctslist and bkgtslist files using the latest SAS version. |
| EmptyGTIList | error |
| | No GTI found to the corresponding CCD. |
| ZeroAreaCorrection | error |
| | Sum of all CCD areas is empty. Please check your source and background expression. |
| EmptyGTI | error |
| | GTI extension empty. |
| BinSizeTooSmall | error |
| | Light curve bin size smaller than frame time. |
| CCDs Count Difference | warning |
| | A difference in the sum of the counts of single CCDs, with respect to the counts of the original light curve, has been found. |
| EventsNotRandomized | warning |
| | Events were not randomized.
corrective action: Run epproc or emproc with randomize option enabled. |
| ZeroArfgenArea | warning |
| | Zero Effective area. Please check your source and background expression. |
| wrongArfgenResults | warning |
| | The effective area calculated for a particular CCD is too small that arfgen gives wrong results. |
| PNTimingRand | warning |
| | Randomization for PN Timing or Burst not implemented |
| NoPIInfoInDss | warning |
| | No PI information in the DSS |