Q: Need help with Time Machine

I have a brand new MacBook Pro.

I have a Time Machine 802.11n with the latest firmware. I know and have verified the password in Airport.

I have been using the Time Machine for a while, last backup October 5. Well, my Time Machine recently wasn't working. I removed the disk and whenever I would try to readd it I get this error:

Keychain error 100001 occurred while creating a System Keychain entry for the username “Justin Cannon” and URL “afp://Justin%20Cannon@Justin%20Cannon's%20Time%20Capsule._afpovertcp._tcp.loca l./Justin's%20Time%20Capsule”.

I tried Disk Repair just in case. No change. Same error. I wanted to go into Keychain Access to remove all the Time Machine entries under the System Keychain thinking that might fix it but I cannot remove them.

Does anyone know what's wrong or how to fix this so I can use Time Machine again?