一运行cairo_pdf命令就出错：cairo_pdf(bg="grey98", pdf_file, width=13,height=10.5)
错误提示：Error in cairo_pdf(bg = "grey98", pdf_file, width = 13, height = 10.5) :
  unable to start device 'cairo_pdf'
In addition: Warning message:
In cairo_pdf(bg = "grey98", pdf_file, width = 13, height = 10.5) :
  cairo error 'error while writing to output stream'
谁有好的解决方法，麻烦赐教