Error(s) in re-building vignettes:
  ...
--- re-building ‘tabr-basics.Rmd’ using rmarkdown
Could not fetch https://github.com/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex00.png?raw=true
HttpExceptionRequest Request {
  host                 = "github.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex00.png"
  queryString          = "?raw=true"
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 ConnectionTimeout
Error: processing vignette 'tabr-basics.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building ‘tabr-basics.Rmd’

--- re-building ‘tabr-chords.Rmd’ using rmarkdown
Could not fetch https://github.com/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex13.png?raw=true
HttpExceptionRequest Request {
  host                 = "github.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex13.png"
  queryString          = "?raw=true"
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 ConnectionTimeout
Error: processing vignette 'tabr-chords.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building ‘tabr-chords.Rmd’

--- re-building ‘tabr-engraving.Rmd’ using rmarkdown
Could not fetch https://github.com/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex32.png?raw=true
HttpExceptionRequest Request {
  host                 = "github.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex32.png"
  queryString          = "?raw=true"
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 ConnectionTimeout
Error: processing vignette 'tabr-engraving.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building ‘tabr-engraving.Rmd’

--- re-building ‘tabr-fretboard.Rmd’ using rmarkdown
--- finished re-building ‘tabr-fretboard.Rmd’

--- re-building ‘tabr-helpers.Rmd’ using rmarkdown
Could not fetch https://github.com/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex12.png?raw=true
HttpExceptionRequest Request {
  host                 = "github.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex12.png"
  queryString          = "?raw=true"
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 ConnectionTimeout
Error: processing vignette 'tabr-helpers.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building ‘tabr-helpers.Rmd’

--- re-building ‘tabr-phrases.Rmd’ using rmarkdown
Could not fetch https://github.com/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex01.png?raw=true
HttpExceptionRequest Request {
  host                 = "github.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex01.png"
  queryString          = "?raw=true"
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 ConnectionTimeout
Error: processing vignette 'tabr-phrases.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building ‘tabr-phrases.Rmd’

--- re-building ‘tabr-prog-chords.Rmd’ using rmarkdown
--- finished re-building ‘tabr-prog-chords.Rmd’

--- re-building ‘tabr-prog-notes.Rmd’ using rmarkdown
--- finished re-building ‘tabr-prog-notes.Rmd’

--- re-building ‘tabr-prog-nw.Rmd’ using rmarkdown
--- finished re-building ‘tabr-prog-nw.Rmd’

--- re-building ‘tabr-prog-scales.Rmd’ using rmarkdown
--- finished re-building ‘tabr-prog-scales.Rmd’

--- re-building ‘tabr-repeats.Rmd’ using rmarkdown
Could not fetch https://github.com/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex17.png?raw=true
HttpExceptionRequest Request {
  host                 = "github.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex17.png"
  queryString          = "?raw=true"
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 ConnectionTimeout
Error: processing vignette 'tabr-repeats.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building ‘tabr-repeats.Rmd’

--- re-building ‘tabr-tracks-scores.Rmd’ using rmarkdown
Could not fetch https://github.com/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex22.png?raw=true
HttpExceptionRequest Request {
  host                 = "github.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex22.png"
  queryString          = "?raw=true"
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 ConnectionTimeout
Error: processing vignette 'tabr-tracks-scores.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building ‘tabr-tracks-scores.Rmd’

--- re-building ‘tabr-tunings.Rmd’ using rmarkdown
Could not fetch https://github.com/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex34.png?raw=true
HttpExceptionRequest Request {
  host                 = "github.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/leonawicz/tabr/blob/master/data-raw/vignette-pngs/ex34.png"
  queryString          = "?raw=true"
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 ConnectionTimeout
Error: processing vignette 'tabr-tunings.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building ‘tabr-tunings.Rmd’

SUMMARY: processing the following files failed:
  ‘tabr-basics.Rmd’ ‘tabr-chords.Rmd’ ‘tabr-engraving.Rmd’
  ‘tabr-helpers.Rmd’ ‘tabr-phrases.Rmd’ ‘tabr-repeats.Rmd’
  ‘tabr-tracks-scores.Rmd’ ‘tabr-tunings.Rmd’

Error: Vignette re-building failed.
Execution halted