Unable to use MyCloud with iMac's TimeMachine

when opening Time Machine preferences → Select Backup Disk → TimeMachineBackup, I got error looks like below:

The disk image “XXX’s iMac.purgeable.sparsebundle” is in use.
Try ejecting the disk image.

I tried to reboot iMac and MyCloud as well, as suggested by some from online, it didn’t work.

Any ideas?

Hi there,

You can try this may it would work-

https://support.wdc.com/knowledgebase/answer.aspx?ID=9531&lang=en

Thanks for your response. However I didn’t see the on/off toggle button on the timemachine preference setting, as what was in the article that you indicated.
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