Pro.sparsebundele is in use. What is it? I got this message when trying to back up my Macbook Pro using time machine:


  The disc image MAMA'S’s MacBook Pro.sparsebundle is in use, try ejecting the disc image.


How do i do it?
Found a solution here:


Access the Airport Extreme using the AirPort Utility.
Go to Manual Setup.
Go to Disks.
Click on Disconnect All Users…


At this stage, unplug or turn the external HD off, the plug it back or turn it on.