Error(s) in re-building vignettes:
--- re-building 'wildlifeDI-vignette-contact_analysis.Rmd' using rmarkdown
Loading required package: sp
Loading required package: ade4
Loading required package: adehabitatMA
Loading required package: CircStats
Loading required package: MASS
Loading required package: boot
Linking to GEOS 3.9.1, GDAL 3.3.2, PROJ 7.2.1
Quitting from lines 29-35 (wildlifeDI-vignette-contact_analysis.Rmd) 
Error: processing vignette 'wildlifeDI-vignette-contact_analysis.Rmd' failed with diagnostics:
there is no package called 'igraph'
--- failed re-building 'wildlifeDI-vignette-contact_analysis.Rmd'

--- re-building 'wildlifeDI-vignette.rmd' using rmarkdown
Loading required package: deldir
deldir 1.0-5      Nickname: "Mendacious Cosmonaut"

     The syntax of deldir() has had an important change. 
     The arguments have been re-ordered (the first three 
     are now "x, y, z") and some arguments have been 
     eliminated.  The handling of the z ("tags") 
     argument has been improved.
 
     The "dummy points" facility has been removed. 
     This facility was a historical artefact, was really 
     of no use to anyone, and had hung around much too 
     long.  Since there are no longer any "dummy points", 
     the structure of the value returned by deldir() has 
     changed slightly.  The arguments of plot.deldir() 
     have been adjusted accordingly; e.g. the character 
     string "wpoints" ("which points") has been 
     replaced by the logical scalar "showpoints". 
     The user should consult the help files.

rgeos version: 0.5-8, (SVN revision 679)
 GEOS runtime version: 3.9.1-CAPI-1.14.2 
 Please note that rgeos will be retired by the end of 2023,
plan transition to sf functions using GEOS at your earliest convenience.
 GEOS using OverlayNG
 Linking to sp version: 1.4-5 
 Polygon checking: TRUE 

--- finished re-building 'wildlifeDI-vignette.rmd'

SUMMARY: processing the following file failed:
  'wildlifeDI-vignette-contact_analysis.Rmd'

Error: Vignette re-building failed.
Execution halted