as.character（x $ content）中的错误：无法将类型“ closure”强制转换为类型“ character”的向量

Question

我正在运行以下代码，但我得到了：

  

错误：无法将类型'closure'强制转换为类型为'character'的向量

#Load required packages
library(ggplot2)
library(tm)
library(wordcloud)
library(syuzhet)

#get the data from whatsapp chat 
texts <- readLines("abc.txt")

#let us create the corpus
docs <- Corpus(VectorSource(text))

#clean our chat data
trans <- content_transformer(function (x , pattern ) gsub(pattern, " ", x))
docs <- tm_map(docs, trans, "/")
docs <- tm_map(docs, trans, "@")
docs <- tm_map(docs, trans, "\\|")
docs <- tm_map(docs, content_transformer(tolower))
docs <- tm_map(docs, removeNumbers)
docs <- tm_map(docs, removeWords, stopwords("english"))
docs <- tm_map(docs, removePunctuation)
docs <- tm_map(docs, stripWhitespace)
docs <- tm_map(docs, stemDocument)