Oracle Apex - Error handling

Page

In a page > Pages Attribute (double click the root node of the page rendering tree) > Error handling.

FUNCTION apex_custom_error (
    p_error IN apex_error.t_error )
  RETURN apex_error.t_error_result
IS
  l_result apex_error.t_error_result;
BEGIN

  IF ( p_error.ora_sqlcode = 1403 ) THEN
    l_result.message      := 'No data was found. Sorry try later';
    -- p_error.ora_sqlcode: error raised by (PL/)SQL
    -- p_error.ora_sqlerrm, 'original error message
    -- p_error.error_backtrace, 'error stack backtrace'     
    -- p_error.page_item_name, 'Associated page item name'
    -- p_error.region_id, 'Associated tabular form region id of the primary application'
    -- p_error.column_alias, 'Associated tabular form column alias'
    -- p_error.row_num, 'Associated tabular form row'
  END IF;
  RETURN l_result;

END;

Application