     ///      - storeURL: An optional String which is appended to the beginning of the persistent store's name.
     ///      - logTag: An optional String that will be used as the tag for logging (default is GenericCoreDataStack).  This is typically used if you are embedding GenericCoreDataStack in something else and you want to to log as your class.
     ///
-    required public init(managedObjectModel model: NSManagedObjectModel, storeLocationURL: URL, storeNamePrefix: String? = nil, configurationOptions options: ConfigurationOptionsType = defaultConfigurationOptions, asyncErrorBlock: ((_ error: NSError) -> Void)? = nil, logTag tag: String = String(describing: GenericCoreDataStack.self)) throws {
+    required public init(managedObjectModel model: NSManagedObjectModel, storeLocationURL: URL, storeNamePrefix: String? = nil, configurationOptions options: ConfigurationOptionsType = defaultConfigurationOptions, asyncErrorBlock: AsynErrorHandlerBlock? = nil, logTag tag: String = String(describing: GenericCoreDataStack.self)) throws {
         
         self.managedObjectModel = model
         self.tag = tag


    fileprivate let rootContext: NSManagedObjectContext
    fileprivate let tag: String
    fileprivate let errorHandlerBlock: (_ error: NSError) -> Void

    ///
    ///  Initializes the receiver with a managed object model.

    ///      - configurationOptions: Optional configuration settings by persistent store config name (see ConfigurationOptionsType for structure)
    ///      - logTag: An optional String that will be used as the tag for logging (default is GenericCoreDataStack).  This is typically used if you are embedding GenericCoreDataStack in something else and you want to to log as your class.
    ///
    public convenience init(managedObjectModel model: NSManagedObjectModel, storeNamePrefix: String, configurationOptions options: ConfigurationOptionsType = defaultConfigurationOptions, asyncErrorBlock: AsynErrorHandlerBlock? = nil, logTag tag: String = String(describing: GenericCoreDataStack.self)) throws {
        //
        // Figure out where to put things
        //
