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Chapter 4 CoreData error on the code

edited October 2013 in More iOS 6 Development
Hi, I had an error on the code of Chapter 4 SuperDB. The error message is following. The code was downloaded from this forum. The duplicate steps are, Adding 2 or over Heroes of same name and identity. Then editing one of the heroes. When you save your changes, the following error occurs. My Xcode is version 5 with iPad and iOS7.
Could anyone give me a hint to resolve this error?
Thank you,

2013-10-02 08:55:16.868 SuperDB[1082:60b] *** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit/UIKit-2903.2/UITableView.m:1330
2013-10-02 08:55:16.870 SuperDB[1082:60b] CoreData: error: Serious application error.  An exception was caught from the delegate of NSFetchedResultsController during a call to -controllerDidChangeContent:.  Invalid update: invalid number of rows in section 1.  The number of rows contained in an existing section after the update (1) must be equal to the number of rows contained in that section before the update (2), plus or minus the number of rows inserted or deleted from that section (0 inserted, 0 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out). with userInfo (null)
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