Why does time machine backup fail, error type -1

We have two Macbooks (2009 and 2010) running 10.6.8. My wife's computer came loaded with 10.5 and was upgraded to 10.6 while my mine came with 10.6 installed. Two months ago our time machine stopped doing backups of my wife's internal 120G(approx) hd while continuing to backup my 250G internal hd. My wife's hd was almost full so I thought that might be the problem. I replaced the hd with a much larger one but it still fails to make new backups. I was able to access the time machine to migrate information to the new hd. The time machine tries to backup but always fail to complete the backup due to a type -1 error. During the migration process I did not migrate applications in case the time mach app was corrupted. Both Macbooks are running time machine version 1.1.

The time machine tries to backup but always fail to complete the backup due to a type -1 error.
There are various things that can cause this error, so there are various solutions.
For some possible solutions, see #C17 in Time Machine guru Pondini's Time Machine -- Troubleshooting.
http://pondini.org/TM/Troubleshooting.html

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