Swift AddObject to NSMutableArray与DynemicCastClassConditional一起崩溃（错误EXC）

我有一个NSObject类型的swift类

class DBObject_Swift : NSObject
{

    //Objects for Category table.
        var CId : Int! = Int();
        var strCType : NSString! = NSString()
    //Objects for Event table.
        var EId : Int! = Int()
        var ECId : Int! = Int()
        var strETitle : NSString! = NSString()
        var strEDateTime : NSString! = NSString()
        var strOccurrence : NSString! = NSString()

    //Objects for ToDoEvent table.
        var TDId : Int! = Int()
        var TDEId : Int! = Int()
        var TDCId : Int! = Int()
        var strTask : NSString! = NSString()
        var strDate : NSString! = NSString()
        var strTDOccurrence : NSString! = NSString()
        var isCompleted : Int! = Int()
}

我想在nsmutableArray中添加上述类的对象

    while rs.next()
    {
        println("\(i++)");
        var dbObj : DBObject_Swift = DBObject_Swift();
        dbObj.CId = Int(rs.intForColumn("CId"));
        dbObj.strCType = rs.stringForColumn("CType");

        arrCategoryDBObj.addObject(dbObj as DBObject_Swift);
    }

但在最后添加到数组中的对象，它会在EXC_断点处崩溃，并且在控制台状态栏中显示DynemicCastClass无条件崩溃类型

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所以如果有人面临这样的问题，请帮助我

你解决这个问题了吗？我有同样的问题当你有这个错误，你想做什么，请解释，然后我会帮助你，因为我的问题太老了，所以。。