Could Not Find Server 'System' In Sysservers. Execute Sp_addlinkedserver To Add The Server To Sysservers.new

Hi

I am getting the above error message when I try and bind a stored procedure to a gridview:

string connectionString2 = ConfigurationManager.ConnectionStrings[project].ConnectionString;
            SqlConnection con_room_code2 = new SqlConnection(connectionString2);

            SqlCommand cmd_sofa = new SqlCommand("report", con_room_code2);
            cmd_sofa.CommandType = CommandType.StoredProcedure;

            cmd_sofa.Parameters.Add(new SqlParameter("@code", SqlDbType.VarChar));
            cmd_sofa.Parameters["@code"].Value = Session["code"].ToString();

            SqlDataSource1.ConnectionString = connectionString2;
            SqlDataSource1.SelectCommand = cmd_sofa.ToString();
           
            plreport.Visible = false;
            plreport.Visible = true;

            test.Text = Session["code"].ToString();


does any1 know why this is? 
 
thanks