Simply run this query in the characters database:
DROP TABLE IF EXISTS `pool_quest_save`;
CREATE TABLE `pool_quest_save` (
`pool_id` int(10) unsigned NOT NULL DEFAULT '0',
`quest_id` int(10) unsigned NOT NULL DEFAULT '0',
PRIMARY KEY (`pool_id`,`quest_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Which we can find in the 3.3.5 sql updates folder; found it in 10 seconds ^^