R v3.1.2でtwitteRを使っていて，"incorrectly called setup_twitter_oauth()"というエラーが出たので．

# R v3.1.2でtwitteRを使っていて，
# "incorrectly called setup_twitter_oauth()"というエラーが出たので対応．
# 参考: Error in check_twitter_oauth() : OAuth authentication error: #74

# error
> setup_twitter_oauth(consumerKey, consumerSecret, accessToken, accessSecret)
> [1] "Using direct authentication"
> Error in check_twitter_oauth() : OAuth authentication error:
> This most likely means that you have incorrectly called setup_twitter_oauth()'

# success
> install.packages("base64enc")
> setup_twitter_oauth(consumerKey, consumerSecret, accessToken, accessSecret)