Index: Ringtoets/HydraRing/src/Ringtoets.HydraRing.IO/HydraRingFileConstants.cs
===================================================================
diff -u -re69acb9595f7bf1d202ddd1fb51934b66768b75d -re9ed7ace8ecabdee49a6635bf43b1fbb3613a090
--- Ringtoets/HydraRing/src/Ringtoets.HydraRing.IO/HydraRingFileConstants.cs	(.../HydraRingFileConstants.cs)	(revision e69acb9595f7bf1d202ddd1fb51934b66768b75d)
+++ Ringtoets/HydraRing/src/Ringtoets.HydraRing.IO/HydraRingFileConstants.cs	(.../HydraRingFileConstants.cs)	(revision e9ed7ace8ecabdee49a6635bf43b1fbb3613a090)
@@ -60,5 +60,10 @@
         /// The database which contains configuration paramters.
         /// </summary>
         internal const string ConfigurationDatabaseFileName = "config.sqlite";
+
+        /// <summary>
+        /// The file name of the file containing the error of a calculation.
+        /// </summary>
+        internal const string LastErrorFileName = "last_error.txt";
     }
 }
\ No newline at end of file