I get this problem on all pkgdown websites, so it is probably specific to my local system. However, I have everything updated (see sessioninfo below), including pandoc etc, so can't figure it out.
# install.packages("devtools")
devtools::install_github("r-lib/pkgdown")
pkgdown::build_site()
# devtools::install_github("r-lib/sessioninfo")
sessioninfo::session_info()
โ Session info โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
setting value
version R version 3.4.2 (2017-09-28)
os macOS High Sierra 10.13.1
system x86_64, darwin15.6.0
ui RStudio
language (EN)
collate en_US.UTF-8
tz America/New_York
date 2017-12-01
โ Packages โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
package * version date source
assertthat 0.2.0 2017-04-11 CRAN (R 3.4.0)
backports 1.1.1 2017-09-25 CRAN (R 3.4.1)
callr 1.0.0.9000 2017-11-30 Github (r-pkgs/callr@550fa6b)
clisymbols 1.2.0 2017-05-21 CRAN (R 3.4.0)
commonmark 1.4 2017-09-01 CRAN (R 3.4.1)
crayon 1.3.4 2017-09-16 CRAN (R 3.4.1)
curl 3.0 2017-10-06 CRAN (R 3.4.2)
debugme 1.1.0 2017-10-22 CRAN (R 3.4.2)
desc 1.1.1 2017-08-03 CRAN (R 3.4.1)
devtools 1.13.4 2017-11-09 CRAN (R 3.4.2)
digest 0.6.12 2017-01-27 CRAN (R 3.4.0)
evaluate 0.10.1 2017-06-24 CRAN (R 3.4.0)
exampleRPackage * 0.2.0 <NA> local
git2r 0.19.0 2017-07-19 CRAN (R 3.4.1)
highlight 0.4.7.2 2017-10-04 CRAN (R 3.4.2)
htmltools 0.3.6 2017-04-28 CRAN (R 3.4.0)
httr 1.3.1 2017-08-20 CRAN (R 3.4.1)
knitr 1.17 2017-08-10 CRAN (R 3.4.1)
magrittr 1.5 2014-11-22 CRAN (R 3.4.0)
MASS 7.3-47 2017-02-26 CRAN (R 3.4.2)
memoise 1.1.0 2017-04-21 CRAN (R 3.4.0)
pkgbuild 0.0.0.9000 2017-11-21 Github (r-lib/pkgbuild@a70858f)
pkgdown 0.1.0.9000 2017-11-30 Github (r-lib/pkgdown@d436a0a)
pkgload 0.0.0.9000 2017-11-21 Github (r-lib/pkgload@70eaef8)
processx 3.0.1 2017-11-30 Github (r-lib/processx@eace505)
purrr 0.2.4 2017-10-18 CRAN (R 3.4.2)
R6 2.2.2 2017-06-17 CRAN (R 3.4.0)
Rcpp 0.12.14 2017-11-23 CRAN (R 3.4.3)
rematch 1.0.1 2016-04-21 CRAN (R 3.4.0)
rlang 0.1.4.9000 2017-11-30 Github (tidyverse/rlang@f96007e)
rmarkdown 1.8.3 2017-11-28 Github (rstudio/rmarkdown@07f7d8e)
roxygen2 6.0.1 2017-02-06 CRAN (R 3.4.0)
rprojroot 1.2 2017-01-16 CRAN (R 3.4.0)
rstudioapi 0.7 2017-09-07 CRAN (R 3.4.1)
sessioninfo 1.0.1.9000 2017-12-01 Github (r-lib/sessioninfo@c871d01)
stringi 1.1.6 2017-11-17 CRAN (R 3.4.2)
stringr 1.2.0 2017-02-18 CRAN (R 3.4.0)
testthat 1.0.2 2016-04-23 CRAN (R 3.4.0)
tibble 1.3.4 2017-08-22 CRAN (R 3.4.1)
whisker 0.3-2 2013-04-28 CRAN (R 3.4.0)
withr 2.1.0 2017-11-01 CRAN (R 3.4.2)
xml2 1.1.1 2017-01-24 CRAN (R 3.4.0)
yaml 2.1.14 2016-11-12 CRAN (R 3.4.0)