backup job wont run at all - hasnt run since install 1 week ago no matter what i do..

i am getting the below error everytime i try and run a backup..
i really dont understand what is happening here, if any one can help me that would be great..
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Log Entry Details
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Type: Error
Date and time: 13/10/2011 2:50:59 PM
Backup plan: [None]
Task: [None]
Code: 20,250,627(0x1350003)
Module: 309
Owner: acronis672038616af91
Message:
Command 'Backing up' has failed.
Additional info:
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Error code: 3
Module: 309
LineInfo: 4a8728dc8a1c94f8
Fields:
Message: Command 'Backing up' has failed.
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Error code: 3
Module: 329
LineInfo: 1cd98aae889424f9
Fields:
Message: Backup has failed.
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Acronis Knowledge Base: http://kb.acronis.com/errorcode/

Event code: 0x01350003+0x01490003

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