Time Machine ,,,,,sparse bundle could not be accessed (error -1)

Time Machine on my iMac (2.66 i5) is failing with the message:
Time Machine could not complete the backup.  The backup image "/Volumes/Time Machine/Shaggylane iMac.sparsbundle" could not be accessed (error -1).
This error appears when the backup is started......it spends a bit of time "Looking for backup drive", then displays the message.
The directory "/Volumes/Time Machine" has the following permissions:
drwx------  13 root        wheel    398 24 Aug 13:15 Time Machine
I was able to login as root and go into that directory.  I didn't see any broken links or anything that stood out.
I was also able to go into Time Machine from the desktop and flip through the backup history.  It seemed to be responding normally.
Time Machine has been working fine for 2+ years.  I suspect it got buggered-up when I accidentally rebooted while it was doing a backup October 12th.  Lion was installed in the spring.  On the 12th, I installed a Lion patch bringing it up to 10.7.2.
Any help would be appreciated.
Regards,
Doug

I have not found a long-term solution (fix), but in my case the volume where the Time Machine backup should occur usually is mounted on the desktop but not as a shared volume (incidated as a drive with the people holding hands superimposed over the drive icon). If I drag the drive to the trash (unmount it), the next time Time Machine is scheduled to run, it completes successfully.

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