upcall should return Closure.RESULT_OK.
diff --git a/js/ccnxProtocol/components/ccnxProtocolService.js b/js/ccnxProtocol/components/ccnxProtocolService.js
index c7d4d1e..42dd1f6 100644
--- a/js/ccnxProtocol/components/ccnxProtocolService.js
+++ b/js/ccnxProtocol/components/ccnxProtocolService.js
@@ -47,7 +47,7 @@
                     if (!(kind == Closure.UPCALL_CONTENT ||

                           kind == Closure.UPCALL_CONTENT_UNVERIFIED))

                         // The upcall is not for us.

-                        return;

+                        return Closure.RESULT_ERR;

                         

                     var contentObject = upcallInfo.contentObject;

                         

@@ -84,6 +84,7 @@
 					}

 						

 					contentListener.onReceivedContent(content, contentType, contentCharset);

+                    return Closure.RESULT_OK;

 				};

 			

 				ndn.expressInterest(new Name(name), new ContentClosure());