Error 0004

from UPDATE `szw_5_mlw_questions` SET `question_name` = ‘When the famous pianist was a child, he was accustomed to ………………. for several a day.’, `answer_array` = ‘a:4:{i:0;a:3:{i:0;s:8:”practice”;i:1;d:0;i:2;i:0;}i:1;a:3:{i:0;s:10:”practicing”;i:1;d:20;i:2;i:1;}i:2;a:3:{i:0;s:9:”practiced”;i:1;d:0;i:2;i:0;}i:3;a:3:{i:0;s:13:”be practicing”;i:1;d:0;i:2;i:0;}}’, `question_answer_info` = ”, `comments` = 1, `hints` = ”, `question_order` = 3, `question_type_new` = ‘1’, `question_settings` = ‘a:1:{s:8:”required”;i:0;}’, `category` = ” WHERE `question_id` = 11