What a pain this has been for me. I have finally narrowed down the culprit for 
an error during migration of core data. 

When I run migration without including MediaPlayer.framework my app runs fine...


2010-09-13 10:41:33.942 Test[3446:207] beginEntityMapping
2010-09-13 10:41:35.803 Test[3446:207] endEntityMapping


When I include MediaPlayer.framework I get this error...

2010-09-13 10:46:15.660 Test[3468:207] beginEntityMapping
2010-09-13 10:46:17.505 Test[3468:207] endEntityMapping
2010-09-13 10:46:20.978 Test[3468:207] Unresolved error Error 
Domain=NSCocoaErrorDomain Code=134110 UserInfo=0x1e2a00 "Operation could not be 
completed. (Cocoa error 134110.)", {
    NSUnderlyingError = Error Domain=NSCocoaErrorDomain Code=256 
UserInfo=0x1e4860 "Operation could not be completed. (Cocoa error 256.)";
    reason = "Failed to save new store after first pass of migration.";
}
Program received signal:  “SIGABRT”.



Does anyone have any idea why this is happening or how I can resolve 
this?_______________________________________________

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