Cannot sync tomboy notes with UbuntuOne in Natty

[Tony Mugan]

I configured tomboy to use UbuntuOne for synchronising notes.
However it says acquiring Sync lock and then could not synchronise notes.

The error below is shown in a terminal and seems to indicate that there is a server issue even though the notes service is listed as working on the ubuntuone website. https://wiki.ubuntu.com/UbuntuOne/Status

me:~$ tomboy
[INFO 12:56:12.203] Initializing Mono.Addins
[ERROR 12:56:23.417] Caught exception. Message: The remote server returned an error: (500) INTERNAL SERVER ERROR.
[ERROR 12:56:23.423] Stack trace for previous exception: at System.Net.HttpWebRequest.CheckFinalStatus (System.Net.WebAsyncResult result) [0x00000] in <filename unknown>:0
  at System.Net.HttpWebRequest.SetResponseData (System.Net.WebConnectionData data) [0x00000] in <filename unknown>:0
[ERROR 12:56:23.427] Rest of stack trace for above exception: at System.Environment.get_StackTrace()
   at Tomboy.WebSync.Api.OAuth.MakeWebRequest(RequestMethod method, System.String url, System.Collections.Generic.List`1 parameters, System.String postData)
   at Tomboy.WebSync.Api.OAuth.WebRequest(RequestMethod method, System.String url, System.String postData)
   at Tomboy.WebSync.Api.OAuth.Get(System.String uri, IDictionary`2 queryParameters)
   at Tomboy.WebSync.Api.UserInfo.GetUser(System.String userUri, IWebConnection connection)
   at Tomboy.WebSync.WebSyncServer.BeginSyncTransaction()
   at Tomboy.Sync.SyncManager.SynchronizationThread()
[ERROR 12:56:23.428] Synchronization failed with the following exception: The remote server returned an error: (500) INTERNAL SERVER ERROR.
  at System.Net.HttpWebRequest.CheckFinalStatus (System.Net.WebAsyncResult result) [0x00000] in <filename unknown>:0
  at System.Net.HttpWebRequest.SetResponseData (System.Net.WebConnectionData data) [0x00000] in <filename unknown>:0

(Tomboy:2568): GLib-CRITICAL **: g_source_remove: assertion `tag > 0' failed

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: tomboy 1.6.0-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-10.46-generic-pae 2.6.38.7
Uname: Linux 2.6.38-10-generic-pae i686
Architecture: i386
Date: Wed Aug 17 12:57:40 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: tomboy
UpgradeStatus: No upgrade log present (probably fresh install)