List Objects Migrations in Realm for Swift 3

Question

I added a list to my realm object class, and i need to migrate but i keep getting this error:

"Migration is required due to the following errors: - Property 'UserIdCard.idImages' has been added."

these are my classes:

class UserIdCard: Object {
    dynamic var idAccountId: Int = 0
    dynamic var idName: String = ""
    dynamic var idType: String = ""
    let idImages = List<UserImage>()

    override static func primaryKey() -> String? {
        return "idAccountId"
    }

}

class UserImage: Object {
    dynamic var image: Data? = nil
}

And this is my migration code:

if (oldSchemaVersion < 4) {
    migration.enumerateObjects(ofType: UserImage.className()) { oldObject, newObject in
      newObject!["image"] = nil
    }
    migration.enumerateObjects(ofType: UserIdCard.className()) { oldObject, newObject in
      let image = migration.create(UserImage.className(), value: Data())
      let images = newObject?["idImages"] as? List<MigrationObject>
      images?.append(image)
    } 
}

I did exactly like the example Realm provided : Link

Also i tried this : Link ,but it's not working, i tried to pass different values in "value" field but nothing worked, what is the right way to migrate a list in realm?

Thanks,