The title is more complicated than it has to be, here\'s the problem query.
SELECT *
FROM query.multi
WHERE queries=\"
SELECT *
FROM html
You need to escape whatever character is delimiting your XPath query with a double backslash... in other words:
SELECT * FROM query.multi
WHERE queries="
SELECT *
FROM html
WHERE url='http://www.stumbleupon.com/url/http://www.guildwars2.com'
AND xpath='//li[@class=\\'listLi\\']/div[@class=\\'views\\']/a/span';
SELECT *
FROM xml
WHERE url='http://services.digg.com/1.0/endpoint?method=story.getAll&link=http://www.guildwars2.com';
SELECT *
FROM json
WHERE url='http://api.tweetmeme.com/url_info.json?url=http://www.guildwars2.com';
SELECT *
FROM xml
WHERE url='http://api.facebook.com/restserver.php?method=links.getStats&urls=http://www.guildwars2.com';
SELECT *
FROM json
WHERE url='http://www.reddit.com/button_info.json?url=http://www.guildwars2.com'"
(try this in the YQL console)