The following block of code results in the error message:

2013-09-13 15:27:08.449 Mobile[746:5603] {MediaLibrary} Rolling back transaction.

```
MPMediaQuery *mediaQuery = [MPMediaQuery songsQuery];
NSArray *collections = [mediaQuery collections];

```

This is in the console as of iOS 7 GM.

This worked without issue in iOS 6. 

Does anyone have any idea what this relates to in iOS 7? I have searched all over, and can find nothing about it.

In addition the message is logged on every iteration of this for loop:

```
for (MPMediaItemCollection *collection in collections) {

    for (MPMediaItem *item in collection.items) {
        //message is written to log here as well

    }
}

```