Error on the page when making on line but there is no error on Local

Hi all,
I am finding the following error on firefox:-
XML Parsing Error: no element found
Location: http://test.freecreditcards4all.com.asp1-10.dfw1-2.websitetestlink.com/testforconnection.aspx
Line Number 1, Column 1:

where as on local there is no error the code contains:


protected void Button1_Click(object sender, EventArgs e)
{
try
{
SqlConnection con = new SqlConnection(WebConfigurationManager.ConnectionStrings["PintooConnection"].ConnectionString);
DataSet Ds = new DataSet();
SqlDataAdapter Da = new SqlDataAdapter("Select * from Emails", con);
Da.Fill(Ds);


for (int i = 0< ...