[Rd] Un-informative Error in re-building vignettes

[Toby Hocking]

I am getting the following on CRAN windows and winbuilder
https://www.r-project.org/nosvn/R.check/r-devel-windows-ix86+x86_64/penaltyLearning-00check.html

Apparently there is an error in re-building vignettes, but I do not have
any idea what it is, because all that is listed is three dots (...). Is
this a bug in R CMD check?

If not, the only solution I can think of is removing the vignette entirely.
Any other ideas?

   - checking re-building of vignette outputs ... [11s] WARNING
   Error in re-building vignettes:
     ...
   - checking PDF version of manual ... OK

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