Index: trunk/ppSub/src/ppSubReadoutSubtract.c
===================================================================
--- trunk/ppSub/src/ppSubReadoutSubtract.c	(revision 24862)
+++ trunk/ppSub/src/ppSubReadoutSubtract.c	(revision 26982)
@@ -71,5 +71,5 @@
     pmFPA *outFPA = outFile->fpa;       // Output FPA
     if (!pmConceptsCopyFPA(outFPA, inFPA, true, true)) {
-        psError(PS_ERR_UNKNOWN, false, "Unable to copy concepts from input to output.");
+        psError(PPSUB_ERR_CONFIG, false, "Unable to copy concepts from input to output.");
         psFree(outRO);
         psFree(view);
@@ -84,13 +84,13 @@
     psFree(view);
     if (!outHDU || !inHDU) {
-        psError(PS_ERR_UNKNOWN, false, "Unable to find HDU at FPA level to copy astrometry.");
+        psError(PPSUB_ERR_PROG, true, "Unable to find HDU at FPA level to copy astrometry.");
         return false;
     }
     if (!pmAstromReadWCS(outFPA, outChip, inHDU->header, 1.0)) {
-        psError(PS_ERR_UNKNOWN, false, "Unable to read WCS astrometry from input FPA.");
+        psError(psErrorCodeLast(), false, "Unable to read WCS astrometry from input FPA.");
         return false;
     }
     if (!pmAstromWriteWCS(outHDU->header, outFPA, outChip, WCS_TOLERANCE)) {
-        psError(PS_ERR_UNKNOWN, false, "Unable to write WCS astrometry to output FPA.");
+        psError(psErrorCodeLast(), false, "Unable to write WCS astrometry to output FPA.");
         return false;
     }