Time Machine Backup No longer available under Lion

I was having a problem with Time Machine, although I didn't know it until today. It had been going through the backup procedure every day.  But today, I decided to go into Time Machine just to look around. It took several tries but it finally came up, however, there wasn't any dates listed on the right side other than today. On the Time Machine Preferences panel, it showed the oldest backup was from August. After reading some comments online, I went into the Select Disk option in the preferences, with the backup disk selected, I set do not back up. I then went back into the Select Disk option and reselected the same disk. Now it shows the oldest date to be none. Other comments said that it would update once a backup is done. When I attempted to do the backup I got an error message that the Backup Disk is not available. Here is the messages:
Dec  1 21:56:09 MacbookPro com.apple.backupd[482]: Backup failed with error: 19
Dec  1 21:58:18 MacbookPro com.apple.backupd[506]: Starting standard backup
Dec  1 21:58:18 MacbookPro com.apple.backupd[506]: Attempting to mount network destination URL: afp://Becky%[email protected]:548/TM%20Backups%20MacBookPro
Dec  1 21:58:19 MacbookPro com.apple.backupd[506]: NAConnectToServerSync failed with error: 80 for url: afp://Becky%[email protected]:548/TM%20Backups%20MacBookPro
Dec  1 21:58:29 MacbookPro com.apple.backupd[506]: Backup failed with error: 19
This backup disk is mounted on an imac, which is also mounted on my MBP. I can open the disk and see all the backup files, however, Time Machine will not honor it (for some reason).
I have rebooted both the MBP and the imac, thinking that would fix it, but it hasn't. I have turned off all backups for now. Can anyone tell me if I can still use the old backups or do I have to start again? If I have to start again, what did I do wrong?

Daniel Wieder wrote:
This backup disk is mounted on an imac, which is also mounted on my MBP.
Try connecting it directly to your MBP.  To see the backups, you'll have to manually mount the sparsebundle they're in (since Time Machine isn't expecting that), and use the Browse ... option, per #E2 in Time Machine - Troubleshooting
You may want to try repairing them, per #A5 in that same article.
If that either finds no problems, or fixes whatever it does find, re-connect it to the iMac and go through the setup procedure again, per #22 in Time Machine - Frequently Asked Questions.
Here's the next thing I tried, with no luck.
MacbookPro:Volumes dwieder$ sudo tmutil inheritbackup
That only works when you get a new Mac, don't use the normal ways to put your data on it, but want to continue using the same set of backups.  See #B6 in the Troubleshooting article.

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