R - tm.plugin.sentiment 中缺少函数

问：

R 有一个用于文本挖掘包的情感分析插件，称为 。我正在尝试使用此包，但在运行该函数时收到缺少函数错误。tmtm.plugin.sentimentscore

# Libraries ---------------------------------------------------------------
install.packages("tm")
install.packages("tm.plugin.sentiment", repos="http://R-Forge.R-project.org")
require(tm)
require(tm.plugin.sentiment)


# Data --------------------------------------------------------------------
data(crude)
corpus <- Corpus(VectorSource(crude))

corpus <- tm_map(corpus, stripWhitespace)
corpus <- tm_map(corpus, removePunctuation)
corpus <- tm_map(corpus, stemDocument)

# Score -------------------------------------------------------------------
score <- score(corpus)

运行时，此代码将导致：

score <- score(corpus)
Error in polarity.TermDocumentMatrix(list(i = c(43L, 79L, 102L, 138L,   
         could not find function "tm_tag_score"

这听起来像是我认为必须弃用（？），但我在安装时没有收到依赖项错误。tm.plugin.tags

此外，此页面似乎表明缺少的功能应该属于活动包，但是我尝试过的每台机器和版本都会发生此错误。tmtm

> sessionInfo()
R version 3.1.0 (2014-04-10)
Platform: i386-w64-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=English_United States.1252 
[2] LC_CTYPE=English_United States.1252   
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets 
[6] methods   base     

other attached packages:
[1] tm.plugin.sentiment_0.0.1 quantmod_0.4-0           
[3] TTR_0.22-0                xts_0.9-7                
[5] zoo_1.7-11                Defaults_1.1-1           
[7] tm_0.6                    NLP_0.1-3                

loaded via a namespace (and not attached):
[1] grid_3.1.0      lattice_0.20-29 parallel_3.1.0 
[4] slam_0.1-32     SnowballC_0.5.1 tools_3.1.0