TM could not complete the backup because xxx.sparsebundle is already in use
I have TimeMachine set up to automatically run and save to my Time Capsule. Just yesterday, I started getting this message "Time Machine could not complete the backup. The backup disk image "/Volumes/Data-1/my MacBook Pro_00264a19425a.sparsebundle" is already in use.
I can't find anything on the help pages that seems to address this issue (or at least, that I understand to address this issue!)
Can anyone please tell me what I need to do to get this working properly again?
MacBook Pro, Mac OS X (10.6.3)