javascript error with WebBrowser

I'm creating an application with WebBrowser component in C # but when I run the following code it returns me a JavaScript error and does not run my other application that was developed in Adobe Flex:

private void chamaPagina(string tipo)
{
    string url = "";
    string pac = "http://localhost/accelerated_pac_base.pac";

    if (tipo == "frete")
    {
        url = "http://localhost/frete.html#";
    }
    else
    {
        url = "http://localhost/posto.html#";
    }

    //Método externo para ler arquivo pac e configurar proxy
    WebRequest requestNavegador = (HttpWebRequest)WebRequest.Create(url);

    string dadosProxy = Proxy.GetProxyForUrlUsingPac(url, pac);

    if (dadosProxy != null)
    {
        requestNavegador.Proxy = new WebProxy(dadosProxy);
    }

    HttpWebResponse response = (HttpWebResponse)requestNavegador.GetResponse();
    Stream receiveStream = response.GetResponseStream();

    webBrowser1.DocumentStream = receiveStream;
}

But if I add webBrowser1.ScriptErrorsSuppressed = true; it did not display the error messages and still does not run my application in Adobe FLEX.