--- a/interp.c	Sat Jun 27 01:50:33 2009 -0400
+++ b/interp.c	Mon Sep 28 19:42:33 2009 -0400
@@ -2702,6 +2702,7 @@
 		}
 	if(room_index_ret)
 		*room_index_ret = -1;
+	printf("Error: Can't set field %s on object with blueprint %s\n", name, company[0]->company);
 	return -1;
 }
 
@@ -2787,6 +2788,8 @@
 		}
 	if(room_index_ret)
 		*room_index_ret = -1;
+	printf("Error: Can't get field %s from object with blueprint %s\n", name, company[0]->company);
+	print_stack_trace(entry->instance);
 	return -1;
 }