无法将“Foundation.URLRequest”类型的值强制转换为“Alamofire.URLConvertible”

问：

我正在尝试使用带有正文的 Alamofire 进行发布请求：

let credential = URLCredential(user: appDelegate.username!, password: appDelegate.password!, persistence: .none)
        
        var url = URL(string: webservice)
        
        var request = URLRequest(url: url!)

        request.setValue("application/json", forHTTPHeaderField: "Content-Type")

        request.setValue("application/json", forHTTPHeaderField: "Accept")

        request.httpMethod = "POST"

        request.httpBody = jsonData
        
        let urlRequest: Alamofire.URLRequestConvertible = request
        
        AF.request(urlRequest as! URLConvertible, headers: headers).authenticate(with: credential).response { response in
            
        }

但是我收到以下错误：

当我执行实际请求时，无法将“Foundation.URLRequest”类型的值转换为“Alamofire.URLConvertible”。如何将我的 Foundation.URLRequest 转换为 Alamofire.URLConvertible？

谢谢

要清理 jsonData 是什么：

let jsonData: Data? = try? JSONSerialization.data(withJSONObject: jsonArrayOfDictionaries, options: .prettyPrinted)

jsonArrayOfDictionaries 为：

var jsonArrayOfDictionaries = [[AnyHashable: Any]]()

它的填充方式如下：

for i in 0..<cellHolder.count {
            
            //Define Dictionary for grading data
            
            var jsonDict = [AnyHashable: Any]()
            
            jsonDict["ID"] = cellHolder[i].id
            
            jsonDict["item"] = cellHolder[i].item
            
            jsonDict["Notes"] = cellHolder[i].notes

            jsonArrayOfDictionaries.append(jsonDict)
            
            jsonDict = [AnyHashable: Any]()


}

cellHolder 是我创建的类的 Array

class MyClass: NSObject {
    
    var id: Int?
    
    var item: String?
    
    var notes: String?
    
    init(id: Int?, item: String?, notes: Int?) {
       super.init()
        
        self.id = id
        
        self.item = item
        
        self.notes = notes
    }
}