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NSObjectInaccessibleException CoreData could not fulfill a fault - still confused
UserPreference *prefEmailAddress;

@property (nonatomic, retain) UserPreference *prefEmailAddress;

NSArray *prefs = [context executeFetchRequest:request error: &error];

if ([prefs count] > 0) {
  prefEmailAddress = [prefs objectAtIndex:0];
  [prefEmailAddress setValue:emailAddress.text forKey:@"prefValue"];
}

NSLog(@"Addr: %@",emailAddress.text);
//    [prefEmailAddress setValue:emailAddress.text forKey:@"prefValue"];