From 5aa9f42875826b8e637463037dfea66521d18c4f Mon Sep 17 00:00:00 2001
From: dellaert <dellaert@cc.gatech.edu>
Date: Sat, 31 May 2014 16:24:25 -0400
Subject: [PATCH] Better exception

---
 gtsam/slam/dataset.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gtsam/slam/dataset.cpp b/gtsam/slam/dataset.cpp
index f381a0786..a1b96d37d 100644
--- a/gtsam/slam/dataset.cpp
+++ b/gtsam/slam/dataset.cpp
@@ -83,7 +83,7 @@ pair<NonlinearFactorGraph::shared_ptr, Values::shared_ptr> load2D(
   cout << "Will try to read " << filename << endl;
   ifstream is(filename.c_str());
   if (!is)
-    throw std::invalid_argument("load2D: can not find the file!");
+    throw std::invalid_argument("load2D: can not find file " + filename);
 
   Values::shared_ptr initial(new Values);
   NonlinearFactorGraph::shared_ptr graph(new NonlinearFactorGraph);