Forum Discussion
I had this same problem and the reason was corrupted ccmerged-file. I deleted everything from DCBackup-folder (made copy of ccmerged-file first and placed it to my desktop for backup if something goes wrong), and then downloaded Nona's Sims ccmerged-file from here:
https://nonasims.wordpress.com/2012/05/17/dcbackup-ccmerged-package-and-your-premium-content-items/
The correct file can be found in the last Q section of the main article ("Q: but I install my store content as package files or I really don't want to create a ccmerged.package.")
Place the downloaded ccmerged-file to your DCBackup-folder (make sure there is nothing else in the folder), and after that it should work perfectly.
Let me know, if this resolved the problem.
Edit: Remember to turn off the EA App's Notifications (from settings) so that Store content shows up correctly in your game.