Backup Problem (yeah, another one)

I'm getting the usual "backup volume could not be mounted" error, but this one is now unique. I haven't had any issues with backups (like stopping on the middle, or power outage), and they've been backing up fine. I haven't been able to hook up my time capsule for about a month, but I went to finally back everything up again, and I get that error. I'm connected, I see the mounted drive an the sparsebundle, but it's not working. Any ideas?