Index: trunk/psModules/src/imcombine/pmSubtractionMatch.c
===================================================================
--- trunk/psModules/src/imcombine/pmSubtractionMatch.c	(revision 26893)
+++ trunk/psModules/src/imcombine/pmSubtractionMatch.c	(revision 26980)
@@ -594,5 +594,5 @@
             // generate the window function from the set of stamps
             if (!pmSubtractionStampsGetWindow(stamps, size)) {
-                psError(PS_ERR_UNKNOWN, false, "Unable to get stamp window.");
+                psError(psErrorCodeLast(), false, "Unable to get stamp window.");
                 goto MATCH_ERROR;
             }