r - KnitR unable to download documents -

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i able run code in r.

setinternet2(use = true) download.file("http://d396qusza40orc.cloudfront.net/dsscapstone/dataset/coursera-swiftkey.zip", "coursera-swiftkey.zip", method = "curl", mode = 'wb') unzip("coursera-swiftkey.zip", files=c("final/en_us/en_us.twitter.txt", "final/en_us/en_us.news.txt", "final/en_us/en_us.blogs.txt"), exdir=".")

but when try use knitr gives me error

quitting lines 15-21 (milestone.rmd)  error in parse(text = x, srcfile = src) : <text>:5:106: unexpected ')' 4: unzip("coursera-swiftkey.zip", files=c("final/en_us/en_us.twitter.txt", "final/en_us/en_us.news.txt", "final/en_us/en_us.blogs.txt"), exdir=".") 5: file.copy(c("final/en_us/en_us.twitter.txt", "final/en_us/en_us.news.txt", "final/en_us/en_us.blogs.txt"?)                                                                                                             ^ calls: <anonymous> ... <anonymous> -> parse_all -> parse_all.character -> parse execution halted

i using r studio , mac os x.

i tried removing s https still di not work.


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