[R] "error setting certificate" issue in R-studio

Mary Huynh enigma1414 at msn.com
Mon Jul 8 21:10:58 CEST 2013

Hi all,

I'm a newbie to R and I can't figure out how to fix this error I keep getting in R-studio:

> "error setting certificate verify locations:\n CAfile: \n CApath: none\n"
Error in twInterfaceObj$doAPICall(cmd,params,"GET",...) :
Error: error setting certificate verify locations:
CApath: none

I'm trying to use the twitteR package to gather tweets from the below 
function. It was working fine before, but I can't find a way to fix 
the certificate issue.I tried using 
 destfile="cacert.pem") with>credential$handshake(cainfo = 
system.file("CurlSSL", "cacert.pem", package = "RCurl")) I saw 
recommended on Stack Overflow but it didn't fix the issue.

>TweetFrame <- function(searchTerm, maxTweets)  
      #twtList is involved in “variable” scoping so it only exists within the  
      # searchTerm needs to be a string so use "#hashtag"
      twtTempFrame<- do.call("rbind", lapply(twtList,as.data.frame))
      # as.data.frame() coerces each list element into a row
      # lapply() applies this to all of the elements in twtList
      # rbind() takes all the rows and puts them together
      # do.call() gives rbind() all the rows as individual elements
      return(twtTempFrame[order(as.integer(twtTempFrame$created)), ])

Thanks in advance for any help!

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