Index: /trunk/src/org/openstreetmap/josm/data/projection/datum/NTV2GridShiftFileWrapper.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/data/projection/datum/NTV2GridShiftFileWrapper.java	(revision 15148)
+++ /trunk/src/org/openstreetmap/josm/data/projection/datum/NTV2GridShiftFileWrapper.java	(revision 15149)
@@ -8,6 +8,4 @@
 import java.util.Objects;
 import java.util.TreeMap;
-
-import org.openstreetmap.josm.tools.Logging;
 
 /**
@@ -69,5 +67,5 @@
             }
             if (instance == null) {
-                Logging.error("Unable to find NTV2 grid shift file for {0}", gridFileName);
+                throw new IOException("Unable to find NTV2 grid shift file for " + gridFileName);
             }
         }