Scraping data using Xpath in curl in R

I am trying to scrape the movie list. For some reason i am getting no values in the movies vector. I am trying to the movies releases this week. Any suggestions?

library(curl)
library(XML)

movies<- xpathSApply(htmlTreeParse("http://www.imdb.com", useInternalNodes = TRUE, encoding='UTF-8'), "//div[2]/div[5]/span/div[1]/div/div/div", xmlValue)
movies<- data.frame(movies)