Index: trunk/psphot/src/psphotErrorCodes.dat
===================================================================
--- trunk/psphot/src/psphotErrorCodes.dat	(revision 27002)
+++ trunk/psphot/src/psphotErrorCodes.dat	(revision 28013)
@@ -11,4 +11,5 @@
 APERTURE		Problem with aperture photometry
 SKY			Problem in sky determination
+IO			Problem in data I/O
 # these errors correspond to standard exit conditions
 ARGUMENTS               Incorrect arguments