HT3275 getting already in use when backing up iMac to Time Machine

I'm getting the following error when trying to backup to my iMac to my Time Machine, and I think it might be related to the MacBook I purchased yesterday and connected it to the same Time Machine.
The backup disk image “/Volumes/Data-1/Martin’s iMac.sparsebundle” is already in use.
Any suggestions on how to determine the problem and resolution?
Marty

A computer is holding open a connection which is stopping other computers from working.. or you have loaded the sparse bundle in finder and it is not being unmounted.
Go to the airport utility.. (5.6 if Lion) and manual setup.. disks page.. disconnect all users.. you will then be able to use the device.
I am assuming Time Machine means Time Capsule.. it is a common mistake.
There are a number of other issues that cause the problem but that is the most common.
Some more info here.
http://pondini.org/TM/C17.html

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