现有的Realm数据库在swift 3.1 xcode 8中不工作

我创建了应用程序使用现有的数据库领域2.3.0和swift 3.1 xcode 8.3 . 但是当我尝试访问领域数据库时 . 有一个错误 .

无法访问数据库：错误域= io.realm代码= 2“无法在路径上打开域”/ Users / dodipurnomo / Library / Developer / CoreSimulator / Devices / 858C796B-CBA8-424B-9A97-0893304B758B / data / Containers /Data/Application/A2D910EE-AAC5-4836-9FE7-97F744E802E5/Documents/Conversio.realm'：不支持的Realm文件格式版本 . “的UserInfo = {NSFilePath = /用户/ dodipurnomo /库/开发商/ CoreSimulator /设备/ 858C796B-CBA8-424B-9A97-0893304B758B /数据/容器/数据/应用/ A2D910EE-AAC5-4836-9FE7-97F744E802E5 /文档/ Conversio . 领域，

当我尝试执行数据库时，上面是一条错误消息 . 至于数据库领域的类如下：

import RealmSwift
import UIKit

class DBManager{
//MARK: - Singleton shared intance

static let sharedIntance = DBManager()
//MARK: - overide init function in realm

static var realm: Realm {
    get {
        do {
            let realm = try Realm()
            return realm
        }
        catch {
            print("Could not access database: ", error)
        }
        return self.realm
    }
}

public static func write(realm: Realm, writeClosure: () -> ()) {
    do {
        try realm.write {
            writeClosure()
        }
    } catch {
        print("Could not write to database: ", error)
    }
}

public static func query(realm: Realm,queryClosure: () -> ()){

}


func save(entityList: [Object], shouldUpdate update: Bool = false) {
    DBManager.realm.beginWrite()
    for entity in entityList {
        if let key = type(of: entity).primaryKey(), let value = entity[key] , update {
            if let existingObject = DBManager.realm.object(ofType: type(of: entity), forPrimaryKey: value as AnyObject) {
                let relationships = existingObject.objectSchema.properties.filter {
                    $0.type == .array
                }
                for relationship in relationships {
                    if let newObjectRelationship = entity[relationship.name] as? ListBase , newObjectRelationship.count == 0 {
                        entity[relationship.name] = existingObject[relationship.name]
                    }
                }
            }
        }
        DBManager.realm.add(entity, update: update)
    }

    do {
        try DBManager.realm.commitWrite()
    } catch let writeError {
        debugPrint("Unable to commit write: \(writeError)")
    }

    DBManager.realm.refresh()
 }
}

我在appdelegate中设置了Realm如下：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    let desPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first!
    let fullDesPath = URL(fileURLWithPath: desPath).appendingPathComponent("Conversio.realm")


    var config = Realm.Configuration()
    config.deleteRealmIfMigrationNeeded = true
    config.fileURL = fullDesPath
    Realm.Configuration.defaultConfiguration = config
    chekDB()
    return true
}


//chek database
func chekDB() {
    let bundleDB = Bundle.main.path(forResource: "Conversio", ofType: "realm")
    let desPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first!
    let fileManager = FileManager.default
    let fullDesPath = URL(fileURLWithPath: desPath).appendingPathComponent("Conversio.realm")
    let fullDestPathString = String(describing: fullDesPath)
    if fileManager.fileExists(atPath: fullDesPath.path){
        print("Database file is exis !")
        print(fileManager.fileExists(atPath: bundleDB!))
    }else{
        do{
            try fileManager.copyItem(atPath: bundleDB!, toPath: fullDesPath.path)
        }catch{
            print("error encured while copying file to directori \(fullDestPathString)")
        }
    }
}