Error(s) in re-building vignettes:
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--- re-building ‘ecb_sdw.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.
Quitting from lines 114-116 (ecb_sdw.Rmd) 
Error: processing vignette 'ecb_sdw.Rmd' failed with diagnostics:
HTTP failure: 500
<html lang="en"><head><title>European Central Bank</title><style type="text/css"> body{ font-family: "Droid Sans", sans-serif; margin:0; padding:0; background-color: #9099ab; text-align: center; } h1{  font-size:38px; font-weight: normal; color:#003299; }  @media screen and (max-width: 480px) { h1{ font-size: 30px; } }  p { font-size: 15px; line-height: 20px; color: #333; margin-bottom: 20px; }  p.signature{ font-style: italic; color:#DF0101; }  .centredFrame { margin: 0 auto; text-align: center; width: 70%;   } .content{ margin-top:40px; padding:40px; background-color: #fff; border:1px solid #CDE3E0; -moz-border-radius: 20px; border-radius: 20px; } </style><link href="//fonts.googleapis.com/css?family=Droid+Sans" rel="stylesheet" type="text/css"></head><body><div class="centredFrame"><div class="content"><img 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
--- failed re-building ‘ecb_sdw.Rmd’

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

Error: Vignette re-building failed.
Execution halted