错误:pandoc文档转换失败,错误43 Windows 7 R studio

我在论坛中搜索了答案,但它们似乎没有用.

我正在使用knitr包在Rstudio中编写pdf文档.我正在使用Windows 7和Rstudio.

pandoc.exe: Error producing PDF from TeX source
Error: pandoc document conversion failed with error 43
In addition: Warning message:
running command '"C:/Program Files/RStudio/bin/pandoc/pandoc" PA1_template.utf8.md --to latex --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash-implicit_figures --output PA1_template.pdf --template "C:\R\Library\rmarkdown\rmd\latex\default.tex" --highlight-style tango --latex-engine pdflatex --variable "geometry:margin=1in"' had status 43 
Execution halted

谢谢,

路易斯