Index: trunk/src/org/openstreetmap/josm/gui/download/WorldChooser.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/download/WorldChooser.java	(revision 1310)
+++ trunk/src/org/openstreetmap/josm/gui/download/WorldChooser.java	(revision 1312)
@@ -77,4 +77,7 @@
             @Override public String toString() {
                 return "WorldChooser";
+            }
+            public String toCode() {
+                return null; /* should never be used, we have no EPSG code */
             }
             public String getCacheDirectoryName() {