Error(s) in re-building vignettes:
  ...
--- re-building ‘FS_guide.ltx’ using tex
Error: processing vignette 'FS_guide.ltx' failed with diagnostics:
Running 'texi2dvi' on 'FS_guide.ltx' failed.
BibTeX errors:
The top-level auxiliary file: FS_guide.aux
I couldn't open style file apa.bst
---line 80 of file FS_guide.aux
 : \bibstyle{apa
 :              }
I'm skipping whatever remains of this command
I found no style file---while reading file FS_guide.aux
--- failed re-building ‘FS_guide.ltx’

--- re-building ‘article.ltx’ using tex
--- finished re-building ‘article.ltx’

--- re-building ‘guide.ltx’ using tex
Error: processing vignette 'guide.ltx' failed with diagnostics:
Running 'texi2dvi' on 'guide.ltx' failed.
BibTeX errors:
The top-level auxiliary file: guide.aux
I couldn't open style file apa.bst
---line 52 of file guide.aux
 : \bibstyle{apa
 :              }
I'm skipping whatever remains of this command
I found no style file---while reading file guide.aux
--- failed re-building ‘guide.ltx’

--- re-building ‘FBED_KVerrou_2_5.Rmd’ using knitr

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

--- finished re-building ‘FBED_KVerrou_2_5.Rmd’

--- re-building ‘MMPC_tutorial.Rmd’ using knitr
--- finished re-building ‘MMPC_tutorial.Rmd’

--- re-building ‘Networks_KVerrou.Rmd’ using knitr

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

--- finished re-building ‘Networks_KVerrou.Rmd’

--- re-building ‘SES_KMVerrou_11_12.Rmd’ using knitr

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

--- finished re-building ‘SES_KMVerrou_11_12.Rmd’

SUMMARY: processing the following files failed:
  ‘FS_guide.ltx’ ‘guide.ltx’

Error: Vignette re-building failed.
Execution halted