R语言导入数据时报错，希望得到帮助

R语言做主成分分析，运行时输入data<-read.table("peas2.csv")

 路径确实是属于当前文件所在的路径下
但是会报错“Error in scan(file = file, what = what, sep = sep, quote = quote, dec = dec, :
line 2 did not have 5 elements”
不明白为什么？