Backs up to iMac but not to MacBook

Hi
This is a tricky one. My iMac is sucsesfully backing up to my time capsule on its daily/weekly shedules, wirelessly. No problem.
My MacBook however is not backing up and hasnt done so since 9 Feb. If I open time machine preferences i see the attached image
offering a back up disk and an available disk. If I select the back up disk, the two options I am presented with are Cancel, and Remove Disk.
I'm not sure what to do from here so as i can start a back up of my MacBook to the time capsule, where my iMac is safetly saving.
Hi
Any clues much appreciated.
Thanks
Rob

This seems to be a bug that gets Mountain Lion messed up.
Reboot the whole network.. restart from off in order.. modem..TC.. clients.
If the issue still exists.. delete all instances of the TC hard disk in finder.
I suggest a reset of TM as well.
See A4 http://pondini.org/TM/Troubleshooting.html
Then using finder on the top menu, go, connect to server. Type in the correct address to the TC..
AFP://TCname or TCIPaddress replacing with the actual name or IP.
Once you bring up the TC manually the TM should be able to select it and then find the old backup and continue.
Tell us if you have more issues.. you might need to start over.

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