Index: trunk/psastro/src/psastroDataSave.c
===================================================================
--- trunk/psastro/src/psastroDataSave.c	(revision 10438)
+++ trunk/psastro/src/psastroDataSave.c	(revision 11269)
@@ -19,5 +19,5 @@
     pmFPAfile *output = psMetadataLookupPtr (NULL, config->files, "PSASTRO.OUTPUT");
     if (!output) {
-	psError(PSASTRO_ERR_CONFIG, true, "Can't find output data!\n");
+	psError(PSASTRO_ERR_CONFIG, true, "Can't find or interpret output file rule PSASTRO.OUTPUT!\n");
 	return false;
     }