Error when Syncing to MS Outlook 2010

Whenever I am synchronizing with MS Outlook 20120, I encountered the error below. Can someone give me an idea that causes this error to appear? Thank you.
08:46:07 GMT +3:00 [ERROR] – Error processing SyncHdr Status
08:46:07 GMT +3:00 [ERROR] – Error in preparing sync: Error reading status code of command ‘SyncHdr’
08:46:08 GMT +3:00 [ERROR] – Sync of contact completed with error 0:
08:46:08 GMT +3:00 [ERROR] – Error processing SyncHdr Status
08:46:08 GMT +3:00 [ERROR] – Error in preparing sync: Error reading status code of command ‘SyncHdr’
08:46:09 GMT +3:00 [ERROR] – Client update error – uses the stored parameters
08:46:09 GMT +3:00 [ERROR] – Sync of appointment completed with error 0:
08:46:09 GMT +3:00 [ERROR] – No response from update server
08:46:10 GMT +3:00 [ERROR] – update check failed.
