NTbackup Exchange 2007

I am on a window 2003 server.  I'm using ntbackup to backup the infostore on the 2007 exchange server to a file.  It backs up all the data then gives this error.  
The 'Microsoft Information Store' returned 'Instance not found

' from a call to 'HrESEBackupSetup()' additional data '-'The 'Microsoft Information Store' returned 'Functions called in an invalid sequence.

The infostore is running on it's own backup.  I've read the stuff about trying to backup the system state and infostore in the same backup.  This is not the problem.  Does anyone have any other ideas.
longshot_tw2Asked:
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Alan HardistyCo-OwnerCommented:
Are you backing up the system state at the same time as the store?  If so, run separate abckups for the system state and store.
Have a read through this article:
http://support.microsoft.com/kb/820272 
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Alan HardistyCo-OwnerCommented:
Are there any errors in the application event logs that are recorded around the time of the failure?
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Alan HardistyCo-OwnerCommented:
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longshot_tw2Author Commented:
Thank you for the help
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