Backup/Sync Agent Fails

i have photoshop elements 8.0 , have been backing up/syncing photoshop.com time.  recently, backing up/syncing stopped working.  here sync log shows:

 

[20100910t225036] info   :syncenginecore:sync init: sleep between sync cycles set [300] seconds
[20100910t225036] info   :syncenginecore:starting new sync cycle...

[20100910t225036] info   :amocparticipant:initialized sync database

[20100910t225036] debug  :emsparticipant:checking disconnect error
[20100910t225036] info   :syncenginecore:checking disconnect timeout :timeout is::7200 min
[20100910t225036] info   :syncenginecore:checking error timeout timeout is::10080 min
[20100910t225037] info   :syncsystemtray:network change detected :: connected
[20100910t225037] info   :emsparticipant:ems user account [lyonszb@gmail.com] login succeeded!!
[20100910t225037] info   :emsparticipant:sleep between sync cycles set [10] minutes
[20100910t225037] info   :emsparticipant:maximum retry time [360] minutes
[20100910t225038] info   :syncsystemtray:in resume state
[20100910t225039] debug  :amocparticipant:attaching amoc catalog

[20100910t225040] debug  :amocparticipant:getting media changes on amoc side!!
[20100910t225041] error  :syncenginecore:database internal error: error encountered in sqlite database: constraint failed
[20100910t225041] error  :syncenginecore:[non retry able] doonesynccycle: database internal error: error encountered in sqlite database: constraint failed
[20100910t225041] info   :syncenginecore:posted quit message main thread.

[20100910t225041] info   :emsparticipant:initializing pse database import!!
[20100910t225041] debug  :emsparticipant:catalog name : c:\users\zlyons\my dropbox\documents\my catalog\catalog.pse8db
[20100910t225041] debug  :emsparticipant:creating connection

the sync agent in system status tray shows few seconds when manually start it, disappears.  no longer shows in system status tray when start windows.  obviously, not working correctly.  ideas on can fix it?  interfering running?

 

i have dropbox on computer backing files.  thought might causing interference since have catalog file inside "dropbox" backed up.  however, still problem when turn dropbox off.

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