this is my session information. I don't know how to edit my post.... so I reply it here
> sessionInfo() R version 2.15.0 (2012-03-30) Platform: x86_64-pc-mingw32/x64 (64-bit) locale: [1] LC_COLLATE=English_Singapore.1252 LC_CTYPE=English_Singapore.1252 LC_MONETARY=English_Singapore.1252 [4] LC_NUMERIC=C LC_TIME=English_Singapore.1252 attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] ROAuth_0.9.2 digest_0.5.2 twitteR_0.99.19 rjson_0.2.10 RCurl_1.95-3 bitops_1.0-4.2 loaded via a namespace (and not attached): [1] tools_2.15.0 -- View this message in context: http://r.789695.n4.nabble.com/twitteR-return-error-message-tp4648841p4648845.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.