Error(s) in re-building vignettes:
  ...
--- re-building ‘cycling-potential-uk.Rmd’ using rmarkdown
Linking to GEOS 3.8.1, GDAL 3.0.4, PROJ 7.0.0

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

Warning: replacing previous import 'sf::st_make_valid' by 'lwgeom::st_make_valid' when loading 'tmap'
--- finished re-building ‘cycling-potential-uk.Rmd’

--- re-building ‘pct-international.Rmd’ using rmarkdown
--- finished re-building ‘pct-international.Rmd’

--- re-building ‘pct.Rmd’ using rmarkdown
--- finished re-building ‘pct.Rmd’

--- re-building ‘pct_training.Rmd’ using rmarkdown

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

tmap mode set to interactive viewing
Linking to GEOS 3.8.1, GDAL 3.0.4, PROJ 7.0.0
Legend for line widths not available in view mode.
Warning in plot.sf(l_top_cycling, add = TRUE, lwd = 5, col = "green") :
  ignoring all but the first attribute
Warning in plot.sf(l_top_driving, add = TRUE, lwd = 5, col = "red") :
  ignoring all but the first attribute
Warning in plot.sf(l_top_cycling, add = TRUE, lwd = 5, col = "green") :
  ignoring all but the first attribute
Warning in plot.sf(l_top_driving, add = TRUE, lwd = 5, col = "red") :
  ignoring all but the first attribute
Warning in plot.sf(l_top_cycling, add = TRUE, lwd = l_top_cycling$bicycle/mean(l_top_cycling$bicycle),  :
  ignoring all but the first attribute
Warning in plot.sf(l_top_driving, add = TRUE, lwd = l_top_driving$car_driver/mean(l_top_driving$car_driver),  :
  ignoring all but the first attribute
2020-04-02 22:47:15 constructing segments
2020-04-02 22:47:15 building geometry
2020-04-02 22:47:15 simplifying geometry
2020-04-02 22:47:15 aggregating flows
2020-04-02 22:47:15 rejoining segments into linestrings
Legend for line widths not available in view mode.
Could not fetch https://raw.githubusercontent.com/npct/pct-team/master/flow-model/flow-diag2.png
HttpExceptionRequest Request {
  host                 = "raw.githubusercontent.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/npct/pct-team/master/flow-model/flow-diag2.png"
  queryString          = ""
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 ResponseTimeout
Error: processing vignette 'pct_training.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building ‘pct_training.Rmd’

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

Error: Vignette re-building failed.
Execution halted