Error(s) in re-building vignettes:
  ...
--- re-building ‘crimeclustering.Rmd’ using rmarkdown
Quitting from lines 218-228 (crimeclustering.Rmd) 
Error: processing vignette ‘crimeclustering.Rmd’ failed with diagnostics:
there is no package called 'fields'
--- failed re-building ‘crimeclustering.Rmd’

--- re-building ‘crimelinkage.Rmd’ using rmarkdown
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Warning in eval(family$initialize) :
  non-integer #successes in a binomial glm!
Loaded gbm 2.1.8
--- finished re-building ‘crimelinkage.Rmd’

SUMMARY: processing the following file failed:
  ‘crimeclustering.Rmd’

Error: Vignette re-building failed.
Execution halted