Index: /trunk/Ohana/src/opihi/lib.shell/evaluate_stack.c
===================================================================
--- /trunk/Ohana/src/opihi/lib.shell/evaluate_stack.c	(revision 15005)
+++ /trunk/Ohana/src/opihi/lib.shell/evaluate_stack.c	(revision 15006)
@@ -67,4 +67,5 @@
       }
 
+      status = FALSE;
       TWO_OP ("M","M",MM_binary);
       TWO_OP ("M","V",MV_binary);
@@ -81,4 +82,6 @@
       
       if (!status) {
+	sprintf (line, "syntax error: invalid operand for binary operation: %s or %s\n", stack[i-1].name, stack[i-2].name);
+	push_error (line);
 	free (tmp_stack.name);
 	return (FALSE);