Localization property had not been set.
diff --git a/org.ascape/plugins/org.ascape.core/META-INF/MANIFEST.MF b/org.ascape/plugins/org.ascape.core/META-INF/MANIFEST.MF
index 353ce08..074b907 100644
--- a/org.ascape/plugins/org.ascape.core/META-INF/MANIFEST.MF
+++ b/org.ascape/plugins/org.ascape.core/META-INF/MANIFEST.MF
@@ -19,3 +19,4 @@
  org.ascape.util.sweep,
  org.ascape.util.vis,
  org.ascape.view.nonvis
+Bundle-Localization: plugin