ASP.Net Oracle Stored Procedure:wrong number or types of arguments in call to 'SP_COUNTRY_SELECT_CRUD'

Hello, 

I am trying to call an Oracle SP in my c# code.  But I am having messages like:

wrong number or types of arguments in call to 'SP_COUNTRY_SELECT_CRUD'

below are c# code:

private DataSet GridBinder()
        {
            string constr = ConfigurationManager.ConnectionStrings["OracleConnectionStringCommon"].ConnectionString;

            DataSet dt = new DataSet();
            using (OracleConnection con = new OracleConnection(constr))
            {
                using (OracleCommand cmd = new OracleCommand())
                {                                                              
                        cmd.Connection = con;
                        cmd.CommandText = "COUNTRY_PACKAGE.SP_COUNTRY_SELECT_CRUD";
                        cmd.CommandType = CommandType.StoredProcedure;                                            
                        OracleDataAdapter adapter = new OracleDataAdapter(cmd);                        
                        adapter.Fill(dt);                        
                        }
                    }
            return dt;
        }

        private void mycountryGridBinder()
        {
            GridView1.DataSource = GridBinder();
            GridView1.DataBind();
        }

ORACLE SP code:

PROCEDURE SP_COUNTRY_SELECT_CRUD (cur OUT SYS_REFCURSOR) AS
  BEGIN
 
    OPEN cur FOR SELECT * FROM Country;
    
  END SP_COUNTRY_SELECT_CRUD;

Country table has two only column fields: Code & Description.