improve error message for clarity


git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@988141 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/sigil/common/obr/src/org/apache/felix/sigil/common/obr/impl/OBRHandler.java b/sigil/common/obr/src/org/apache/felix/sigil/common/obr/impl/OBRHandler.java
index ff08eb4..42c2b57 100644
--- a/sigil/common/obr/src/org/apache/felix/sigil/common/obr/impl/OBRHandler.java
+++ b/sigil/common/obr/src/org/apache/felix/sigil/common/obr/impl/OBRHandler.java
@@ -132,7 +132,7 @@
             {
                 if (!sanity.add(uri))
                 {
-                    throw new RuntimeException(uri);
+                    throw new RuntimeException("Duplicate uri " + uri);
                 }
                 ISigilBundle b = ModelElementFactory.getInstance().newModelElement(
                     ISigilBundle.class);