无法将json字符串转换为json对象

let dictionaryToJsonObject: [String: Any]

let Dictionary: [String: Any] = ["FirstName": "John", "Email": "[email protected]", "Password": "john@123", "LastName": "Smith", "Organization": ["Type": 5, "Name": "IT"]]

do {
    let jsonData = try JSONSerialization.data(withJSONObject: Dictionary as Any, options: .prettyPrinted)
    let jsonText = String(data: jsonData,
                          encoding: .ascii)

    print("JSON string = \(jsonText!)")

    if JSONSerialization.isValidJSONObject(jsonText!) {
        print("Valid")
    } else {
        print("Not Valid")
    }

}catch {
    print(error.localizedDescription)
}
let dictionaryToJsonObject: [String: Any]

let