Index: trunk/ppSub/src/ppSubDefineOutput.c
===================================================================
--- trunk/ppSub/src/ppSubDefineOutput.c	(revision 26899)
+++ trunk/ppSub/src/ppSubDefineOutput.c	(revision 26982)
@@ -55,10 +55,10 @@
 
     if (!kernels) {
-	hdu = pmHDUFromCell(refConv->parent);
+        hdu = pmHDUFromCell(refConv->parent);
         analysis = refConv->analysis;
         kernels = psMetadataLookupPtr(&mdok, analysis, PM_SUBTRACTION_ANALYSIS_KERNEL);
     }
     if (!kernels) {
-        psError(PS_ERR_UNEXPECTED_NULL, true, "Unable to find SUBTRACTION.KERNEL");
+        psError(PPSUB_ERR_UNKNOWN, true, "Unable to find SUBTRACTION.KERNEL");
         psFree(outRO);
         return false;