file（file，“ rt”）中的错误：设置工作目录时无效的'description'参数

Question

我正在设置工作目录以在R上运行差异表达式代码。我不断收到此错误，file（file，“ rt”）中的错误：无效的'description'参数

我尝试使用setwd更改目录，但这没有用

source("https://bioconductor.org/biocLite.R")
biocLite("ballgown")
library(ballgown)
install.packages("calibrate")
library(calibrate)

##specify data directory and make ballgown object##
###directory files must look EXACTLY like the files in the example ballgown extdata directory###
data_directory=file.path("user/cash/Desktop/ccar-1 differential expression analysis/differential expresison")
data_directory
bg=ballgown(dataDir=data_directory, samplePattern='IKH', meas='all')
meas = 
###[ballgown instance with 227079 transcripts and 12 samples]###
View(bg)
sampleNames(bg)

错误消息是

  

文件（文件，“ rt”）中的错误：无效的“描述”参数