我正在使用knitr来构建一个R包小插图.此过程在R 3.0之前有效,但我无法在R 3.1.1下重建该软件包.
当我尝试时R CMD build收到错误消息:
R CMD build Causata
* checking for file ‘Causata/DESCRIPTION’ ... OK
* preparing ‘Causata’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ...
ERROR Error in loadVignetteBuilder(vigns$pkgdir) :
vignette builder 'knitr' not found Calls: <Anonymous> -> loadVignetteBuilder
In addition:
Warning message: In tools::buildVignettes(dir = ".", tangle = TRUE) :
Files named as vignettes but with no recognized vignette engine:
‘vignettes/Causata-vignette.rnw’ (Is a VignetteBuilder field …