SELECT ads_words_id ADS_WORDS_ID, visible_caption VISIBLE_CAPTION, site_caption, paper_caption PAPER_CAPTION, default_selected DEFAULT_SELECTED, id_value_type ID_VALUE_TYPE from ads_ref_book_items order by section_word_id, ads_words_idMySQL server has gone away in query

in file /html/classes/db.class.php in line 130