Error in re-building vignettes:
  ...
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Loading required package: ape
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.

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

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Allenopithecus_nigroviridis'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Allocebus_trichotis'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Alouatta_belzebul'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Alouatta_caraya'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Alouatta_coibensis'

Not found. Consider checking the spelling or alternate classification
Warning in taxize_nexml(.) :
  ID for otu Alouatta_coibensis not found. Consider checking the spelling or alternate classification
No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Alouatta_fusca'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Alouatta_palliata'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Alouatta_pigra'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Alouatta_sara'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Alouatta_seniculus'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Aotus_azarai'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Aotus_brumbacki'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Aotus_hershkovitzi'

Not found. Consider checking the spelling or alternate classification
Warning in taxize_nexml(.) :
  ID for otu Aotus_hershkovitzi not found. Consider checking the spelling or alternate classification
No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Aotus_infulatus'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Aotus_lemurinus'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Aotus_miconax'

Not found. Consider checking the spelling or alternate classification
Warning in taxize_nexml(.) :
  ID for otu Aotus_miconax not found. Consider checking the spelling or alternate classification
No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Aotus_nancymaae'

No ENTREZ API key provided
 Get one via use_entrez()
See https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/02/new-api-keys-for-the-e-utilities/

Retrieving data for taxon 'Aotus_nigriceps'

Quitting from lines 205-209 (metadata.Rmd) 
Error: processing vignette 'metadata.Rmd' failed with diagnostics:
Error in the HTTP2 framing layer
Execution halted