JDBC Invalid column index: getValidColumnIndex Error

        public static void main(String[] args) throws SQLException
        {
            DBConnection dbc = new DBConnection(); // generate the connection string and object
            Connection conn = dbc.getDBConnection(); // get the connection object
            //interact with the database
            Statement statement = conn.createStatement();
            ResultSet resultSet = null; // get the result of the query to the database

            resultSet = statement.executeQuery(Suppliers.selectSuppliersTableString);
            System.out.println(Suppliers.columnHeadersString);
    //      ResultPrinter.resultPrinter(resultSet);
            ResultSetMetaData rsmd = resultSet.getMetaData();
            int columnCount = rsmd.getColumnCount();
            System.out.println("Columns: " + columnCount);
            System.out.println(rsmd.getColumnName(0));
        }