Timecapsule message reads: "Macintosh.sparsebundle" is already in use. What does it mean and what can I do to make my Time Machine work again?

I receive the following message when my MacBook tries to run Time Machine to back up to our Time Capsule:
The backup disk image “/Volumes/Jonathan Black's Time Caps/Macintosh.sparsebundle” is already in use.
So now what?

I also was plagued with this problem and resolved it by physically switching off time capsule and pulling out all conections to it.  Then I rebooted my imac and plugged everything back into time capsule and switched it on
This did resolve the problem but it came back the next day so I this time just switched off time capsule at the main switch and it started to work again
At this point I decided to add an extra external drive as a time machine backup
At the last point of setting up the second drive (WD MyBook) i was asked if I wanted to use this for backups or keep both
I chose both.  Now my backups are alternating between the two drives.  So far so good Have not seen the message again

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