HT201514 Why can't I select my disk for use with Time Machine with OS 10.6.8?

I have used Time Machine for some time with my MacBook Pro. However, my backup disk does not show in Time Machine. It did however, offer me the chance to stop a backup, so I checked that off. Now I can't even set up Time Machine; every time I slide the switch to On, a window pops up that says something about Airport Extreme, which I know nothing about and doubt I that I use.

Pudge7 wrote:
I have used Time Machine for some time with my MacBook Pro. However, my backup disk does not show in Time Machine. It did however, offer me the chance to stop a backup, so I checked that off.
It sounds like the backups may be damaged;  try to Repair them, per #A5 in Time Machine - Troubleshooting.

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