Error in re-building vignettes:
  ...
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
Warning in structure(res, label = node$name, members = 1, height = height,  :
  Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
  Consider 'structure(list(), *)' instead.
PhantomJS not found. You can install it with webshot::install_phantomjs(). If it is installed, please make sure the phantomjs executable can be found via the PATH variable.
Warning in normalizePath(f2) :
  path[1]="./webshot2db4659b3522.png": No such file or directory
Warning in file(con, "rb") :
  cannot open file './webshot2db4659b3522.png': No such file or directory
Quitting from lines 512-515 (data.tree.Rmd) 
Error: processing vignette 'data.tree.Rmd' failed with diagnostics:
cannot open the connection
Execution halted