运行knitr :: knit2pdf的texi2dvi出错

luc*_*ano 11 latex r knitr

如果我跑

knit2pdf("test.Rnw")
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... knitr在R中使用.Rnw文件,我收到此错误:

Error in texi2dvi(file = file, pdf = TRUE, clean = clean, quiet = quiet,  : 
  Running 'texi2dvi' on 'test.tex' failed.
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谁知道我怎么解决?