From 5e547612018969e212a59c21249857534b6f39d2 Mon Sep 17 00:00:00 2001
From: Houtan Bastani <houtan@dynare.org>
Date: Mon, 30 Sep 2019 14:27:58 +0200
Subject: [PATCH] clarify error message in
 bfcfbac66d3dec21853a1b1bb575291d80d99b69. #29

---
 src/ExprNode.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ExprNode.cc b/src/ExprNode.cc
index 58d4d888..7e0a814f 100644
--- a/src/ExprNode.cc
+++ b/src/ExprNode.cc
@@ -1212,7 +1212,7 @@ VariableNode::writeOutput(ostream &output, ExprNodeOutputType output_type,
           exit(EXIT_FAILURE);
         }
     case SymbolType::unusedEndogenous:
-      cerr << "ERROR: You cannot use an unused endogenous variable in an expression" << endl;
+      cerr << "ERROR: You cannot use an endogenous variable in an expression if that variable has not been used in the model block." << endl;
       exit(EXIT_FAILURE);
     case SymbolType::externalFunction:
     case SymbolType::trend: