Index: trunk/psModules/src/imcombine/pmSubtractionMask.c
===================================================================
--- trunk/psModules/src/imcombine/pmSubtractionMask.c	(revision 26893)
+++ trunk/psModules/src/imcombine/pmSubtractionMask.c	(revision 27086)
@@ -146,5 +146,5 @@
     if (!psImageConvolveMask(mask, mask, PM_SUBTRACTION_MASK_BAD_1, PM_SUBTRACTION_MASK_CONVOLVE_1,
                              -size, size, -size, size)) {
-        psError(PS_ERR_UNKNOWN, false, "Unable to convolve bad pixels from mask 1.");
+        psError(psErrorCodeLast(), false, "Unable to convolve bad pixels from mask 1.");
         psFree(mask);
         return NULL;
@@ -152,5 +152,5 @@
     if (!psImageConvolveMask(mask, mask, PM_SUBTRACTION_MASK_BAD_2, PM_SUBTRACTION_MASK_CONVOLVE_2,
                              -size, size, -size, size)) {
-        psError(PS_ERR_UNKNOWN, false, "Unable to convolve bad pixels from mask 2.");
+        psError(psErrorCodeLast(), false, "Unable to convolve bad pixels from mask 2.");
         psFree(mask);
         return NULL;
@@ -176,5 +176,5 @@
     if (!psImageConvolveMask(mask, mask, maskRej, PM_SUBTRACTION_MASK_REJ,
                              -footprint, footprint, -footprint, footprint)) {
-        psError(PS_ERR_UNKNOWN, false, "Unable to convolve bad pixels.");
+        psError(psErrorCodeLast(), false, "Unable to convolve bad pixels.");
         psFree(mask);
         return NULL;