tomboy cannot sync, error status 500

01.07.2011 10:52:55 [INFO]: Initializing Mono.Addins
01.07.2011 11:04:38 [ERROR]: Caught exception. Message: The remote server returned an error: (500) INTERNAL SERVER ERROR.
01.07.2011 11:04:38 [ERROR]: 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
01.07.2011 11:04:38 [ERROR]: 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()
01.07.2011 11:04:38 [ERROR]: 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
01.07.2011 11:04:54 [ERROR]: Caught exception. Message: The remote server returned an error: (500) INTERNAL SERVER ERROR.
01.07.2011 11:04:54 [ERROR]: 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
01.07.2011 11:04:54 [ERROR]: 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()
01.07.2011 11:04:54 [ERROR]: 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
roman@swan:~/Software/pg2mysql-1.7$ cat /home/roman/.config/tomboy/tomboy.log
01.07.2011 11:06:24 [INFO]: Initializing Mono.Addins
01.07.2011 11:06:41 [ERROR]: Caught exception. Message: The remote server returned an error: (500) INTERNAL SERVER ERROR.
01.07.2011 11:06:41 [ERROR]: 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
01.07.2011 11:06:41 [ERROR]: 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()
01.07.2011 11:06:41 [ERROR]: 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