From dba3a0be2f128792bcd20936e67f52c819b32389 Mon Sep 17 00:00:00 2001
From: Patrick Shriwise <pshriwise@gmail.com>
Date: Sat, 14 May 2022 18:44:57 -0500
Subject: [PATCH] Err msg for missing DAGMC file

---
 src/dagmc.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/dagmc.cpp b/src/dagmc.cpp
index 9b894d3bb..8131c9929 100644
--- a/src/dagmc.cpp
+++ b/src/dagmc.cpp
@@ -50,6 +50,9 @@ DAGUniverse::DAGUniverse(pugi::xml_node node)
 
   if (check_for_node(node, "filename")) {
     filename_ = get_node_value(node, "filename");
+    if (!file_exists(filename_)) {
+      fatal_error(fmt::format("DAGMC file '{}' could not be found", filename_));
+    }
   } else {
     fatal_error("Must specify a file for the DAGMC universe");
   }