Unauthorized error with Twitter OAuth - r

Question

I noticed many threads regarding problems with Twitter API authentication but apparently no one seem relevant to my problem. As soon as I try to authenticate, right after I am asked to enter the PIN, the system throws an error ("Unauthorized"). This happens before I can enter the PIN.
The code is:
library("twitteR")
library("RCurl")
library("ROAuth")
# Set SSL certs globally
options(RCurlOptions = list(cainfo = system.file("CurlSSL", "cacert.pem", package = "RCurl")))
Credentials <- OAuthFactory$new(
consumerKey = "XX",
consumerSecret = "XX",
oauthKey = "XX",
oauthSecret = "XX",
requestURL = "https://api.twitter.com/oauth/request_token",
authURL = "https://api.twitter.com/oauth/authorize",
accessURL = "https://api.twitter.com/oauth/access_token")
Credentials$handshake(cainfo = system.file("CurlSSL", "cacert.pem", package = "RCurl"))
And the results is:
To enable the connection, please direct your web browser to:
https://api.twitter.com/oauth/authorize?oauth_token=XX
When complete, record the PIN given to you and provide it here:
Error: Unauthorized
As mentioned above, this happens before I can actually enter my PIN. I run the script in RStudio but running on classic R GUI does not make any change. I am running R version 3.0.1.
Post Scriptum
I tried different version of the code, for example this one, but I get the exact same error.

Answer 1

You can follow this step:
reqURL <- "https://api.twitter.com/oauth/request_token"
accessURL <- "https://api.twitter.com/oauth/access_token"
authURL <- "https://api.twitter.com/oauth/authorize"
consumerKey <- "Mjn6tdsadsadkasdklad2SV1l"
consumerSecret <- "58Z7Eldsdfaslkf;asldsaoeorjkfksaVCQtvri"
twitCred <- OAuthFactory$new(consumerKey=consumerKey,
consumerSecret=consumerSecret,
requestURL=reqURL,
accessURL=accessURL,
authURL=authURL)
twitCred$handshake()
After you run this code you will see in R console message like this :
To enable the connection, please direct your web browser to:
https://api.twitter.com/oauth/authorize?oauth_token=scmVODruosvz6Tdsdadadasdsa
When complete, record the PIN given to you and provide it here:
Just paste the link to your browser then authorize app, last one you will get the PIN code, just copy and paste the PIN code to your R console.
registerTwitterOAuth(twitCred)
R console will show TRUE if you success.
user <- getUser("xxx")
userTimeline(user, n=20, maxID=NULL, sinceID=NULL, includeRts=FALSE)
If still any problem just try to show your package version and update to the last version
sessionInfo()
update.packages("twitteR")
The last version for twitteR is 1.1.7 => http://cran.r-project.org/web/packages/twitteR/index.html
You can download twitteR manual => see page number 12 http://cran.r-project.org/web/packages/twitteR/twitteR.pdf