php – MultipartFormDataSection FormatException POST

I'm trying to cross to post data of a small form made in the unit.

When I create a user job;

public void NewAccount ()
{
Listing formData = new list();
formData.Add (new MultipartFormDataSection ("name", _newNameIntroduced.text));
formData.Add (new MultipartFormDataSection ("password", _newContrasenaIntroducida.text));

UnityWebRequest www = UnityWebRequest.Post (_newUserURL, formData);
StartCoroutine (WaitForRequest (www));
}

Method that works perfectly.

The problem occurs when sending data to authenticate the user.

public void VerifyAccount ()
{
Listing formData = new list();
formData.Add (new MultipartFormDataSection ("name", _ nameIntroduced.text));
formData.Add (new MultipartFormDataSection ("password", _ contrasenaIntroducida.text));

UnityWebRequest www = UnityWebRequest.Post (_LoadUserURL, formData);
Debug.Log ("1");
StartCoroutine (WaitForRequest (www)); Debug.Log ("1.5");
}

Method WaitForRequest;

Private IEnumerator WaitForRequest (UnityWebRequest postUser)
{
Debug.Log ("2");
return return postUser.SendWebRequest ();
Debug.Log (postUser.downloadHandler.text);
if (Convert.ToInt32 (postUser.downloadHandler.text)! = 200)
{
#if UNITY_ANDROID &&! UNITY_EDITOR
dialog.showDialog ("Error");
#endif
Debug.Log ("Error");
}
if not
{
#if UNITY_ANDROID &&! UNITY_EDITOR
dialog.showDialog ("Success");
#endif
Debug.Log ("Success");
}

}

Debugging stays at 1.5 (the message I print), then spits the next error;

FormatException: the input string was not in the correct format
System.Int32.Parse (System.String s) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Int32.cs:629)
System.Convert.ToInt32 (System.String value) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Convert.cs:1270)

If this method, I only enter integer values ​​in the field Entrance the method is executed without exception, which I do not understand since NewAccount () He admits figures and letters.