Application.LoadLevel Error (Possible cause: URL request conditioning went wrong)

Hi, I am currently working on a login function for my apps. When testing it with the correct Username and password, the server responds with status ok and it goes to the content page as intended. Then, testing it with the incorrect Username or password, as intended that the server responds with “authentication failure” but it still goes to the content page (unexpected) instead of going back to the login menu.

Can you help me point out what mistakes I’ve done that causes the error?

Here is my code (C#) :

IEnumerator Login()
{

	WWWForm form= new WWWForm ();

	form.AddField ("name", usernamehere);
	form.AddField ("pswd", passwordhere);

	WWW download = new WWW (url, form);
	
	yield return download;
	
	if (download.error == null) {
					Debug.Log (download.text);
		goToContents();
			} 
            else {

                    Debug.Log (download.text);

                    goBackToLoginMenu ();

                  }

          }

void goBackToLoginMenu()
{
	Application.LoadLevel ("LoginMenu");
	}

void goToContents()
{
	Application.LoadLevel ("Contents");
}

As per the doc, you should not just check it for null, you should check it for both null and empty string.

A part from doc:

If there was no error, error will
return null or an empty string (this
is because some platforms don’t allow
nulls for string values). We recommend
that you use String.IsNullOrEmpty to
check for the presence of an error so
that both cases are covered.

Perhaps like this can resolve it:

 if (string.IsNullOrEmpty(download.error)) {
     Debug.Log (download.text);
     goToContents();
 } 
 else {

     Debug.Log (download.text);
     goBackToLoginMenu ();
 }