Json Parse Error Unity

Getting Started
1 
IEnumerator Login()
    {
        WWWForm form = new WWWForm();
        form.AddField("action", "login");
        form.AddField("_nickname", Nickname_IF_Log.text);
        form.AddField("_email", Email_IF_Log.text);
        form.AddField("_password", Password_IF_Log.text);

        using (UnityWebRequest www = UnityWebRequest.Post("http://localhost:8080/cosmicorigins/login.php", form))
        {
            yield return www.SendWebRequest();

            if (www.result != UnityWebRequest.Result.Success)
            {
                Debug.Log(www.error);
            }
            else
            {
                Debug.Log("Query Result:" + www.downloadHandler.text);

               AuthResult authResult = JsonUtility.FromJson<AuthResult>(www.downloadHandler.text); (cs:271)

                if (authResult.status)
                {
                    PlayerPrefs.SetInt("ID", authResult._id);

                    Password_IF_Log.text = "";
                    Email_IF_Log.text = "";
                    Nickname_IF_Log.text = "";
                    Message_Warning_Log.text = "Login Successfully!";
                    ProggressBar.gameObject.SetActive(true);
                    StartCoroutine(LoadingCharacterCustomizedScene());
                    StartCoroutine(Loginsuccessfullyfalse());
                }
                else
                {

                    StartCoroutine(Loginsuccessfullyfalse());
                }
            }
        }
    }
}

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**Hello, I have the following C# code and I’m encountering a JSON parse error. I would greatly appreciate your assistance in resolving this issue. The error message is provided below:

============================================================================
ArgumentException: JSON parse error: Invalid value.
UnityEngine.JsonUtility.FromJson (System.String json, System.Type type) (at <9022f24b5f99402395bd0f17ce2ed626>:0)
UnityEngine.JsonUtility.FromJson[T] (System.String json) (at <9022f24b5f99402395bd0f17ce2ed626>:0)
AuthManager+d__33.MoveNext () (at Assets/Scripts/AuthManager.cs:271)
UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at <4014a86cbefb4944b2b6c9211c8fd2fc>:0)

=============================================================================

**I’ve indicated the part where the error occurs in the code within quotation marks.

2

You could post at least a JSON example. That you have a parse error is no information at all. At this stage I can only tell that you can have wrong JSON or wrong AuthResult.