Error(s) in re-building vignettes:
--- re-building ‘Executing_Business_Rules_At_Scale_With_RDrools_using_Drools.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Loading required package: rJava
Loading required package: Rdroolsjars

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


Attaching package: 'purrr'

The following object is masked from 'package:magrittr':

    set_names

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.thoughtworks.xstream.core.util.Fields (file:/Volumes/SSD-Data/Builds/R-dev-web/QA/Simon/packages/el-capitan-x86_64/Rlib/3.6/Rdroolsjars/java/xstream-1.4.9.jar) to field java.util.TreeMap.comparator
WARNING: Please consider reporting this to the maintainers of com.thoughtworks.xstream.core.util.Fields
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Warning in if (class(intermediateOutput) == "list") { :
  the condition has length > 1 and only the first element will be used
Warning: filter_() is deprecated. 
Please use filter() instead

The 'programming' vignette or the tidyeval book can help you
to program with filter() : https://tidyeval.tidyverse.org
This warning is displayed once per session.
Warning in if (class(intermediateOutput) == "list") { :
  the condition has length > 1 and only the first element will be used
Warning in normalizePath(f2) :
  path[1]="webshot42723cd7872a.png": No such file or directory
Warning in file(con, "rb") :
  cannot open file 'webshot42723cd7872a.png': No such file or directory
Quitting from lines 374-381 (Executing_Business_Rules_At_Scale_With_RDrools_using_Drools.Rmd) 
Error: processing vignette 'Executing_Business_Rules_At_Scale_With_RDrools_using_Drools.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘Executing_Business_Rules_At_Scale_With_RDrools_using_Drools.Rmd’

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

Error: Vignette re-building failed.
Execution halted