TC won't backup

I've had my 500 GB TC for several months now, had it backing up for the first few months but it became annoying so I've stopped having it back up since I really wasn't making any new files. Now I'd like it to do a back up and I'm getting an error message saying "Back up failed" and "Back up drive can not be mounted."
I remember reading in the past that apple suggests backing up regularly, could this be why? Any suggestions on how to get it backing up again? Would it be bad to delete the sparse bundle and start over?

That was exactly the problem, I figured it out shortly after I posted the question. I changed passwords recently so I had to select the new TC in preferences.
Thanks!

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