Can't backup 2nd computer

Question

I connected and backed up my MBP with no problem, but when I tried to backup my daughter's MB I could not do it.
I opened Time Machine on her computer, clicked on "Change Disk" and selected the Time Capsule. At that point it asked for the password, so I entered the password I created when I setup TC from my computer, it seemed to accept that.
Next, I clicked on "Backup now" from the menu bar, Time Machine; below the status bar it displayed "Preparing", then an error window opened with the following message:
Time Machine Error
The backup disk image could not be created.
From what I read here, and on FAQ, all I should have had to do was connect to the TC and start the TM backup. Any thoughts as to what is wrong?

Answer 1

On the computer that cannot backup, open System Preferences and then open Sharing
Make sure that the computer name appears. It should be less than 27 characters and avoid apostrophes or other exclamation marks.
Also, on the same computer, click in an open area of your desktop to show the Finder menus at the top of the screen. Click on Finder and then click on Preferences and then the General tab. Under the heading of "show these items on the desktop", make sure there is a check mark next to "Connected Servers"
Restart the computer and then try the backup again. Any help?
If not, open Applications > Utilities > Disk Utility
Click on the exact name of the hard drive on your desktop to highlight it. If you have not changed this, it will be Macintosh HD. Then click Repair Disk Permissions.
Depending on how much data you have on the disk, this will take 20-45 minutes. You will be notified when the action is complete.
Then, try a backup again.
Message was edited by: Bob Timmons