Error(s) in re-building vignettes:
  ...
--- re-building 'blog.Rmd' using rmarkdown
Files identified: dftRoadSafetyData_Accidents_2017.zip

   http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafetyData_Accidents_2017.zip
Attempt downloading from: 
trying URL 'http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafetyData_Accidents_2017.zip'
Content type 'application/x-zip-compressed' length 3997883 bytes (3.8 MB)
==================================================
downloaded 3.8 MB

Data saved at /tmp/Rtmp2792cq/dftRoadSafetyData_Accidents_2017/Acc.csv
Reading in: 
/tmp/Rtmp2792cq/dftRoadSafetyData_Accidents_2017/Acc.csv
Linking to GEOS 3.7.1, GDAL 2.4.0, PROJ 5.2.0

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

Files identified: dftRoadSafetyData_Casualties_2017.zip

   http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafetyData_Casualties_2017.zip
Attempt downloading from: 
trying URL 'http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafetyData_Casualties_2017.zip'
Content type 'application/x-zip-compressed' length 1169376 bytes (1.1 MB)
==================================================
downloaded 1.1 MB

Data saved at /tmp/Rtmp2792cq/dftRoadSafetyData_Casualties_2017/Cas.csv
Files identified: dftRoadSafetyData_Vehicles_2017.zip

   http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafetyData_Vehicles_2017.zip
Attempt downloading from: 
trying URL 'http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafetyData_Vehicles_2017.zip'
Content type 'application/x-zip-compressed' length 2584589 bytes (2.5 MB)
==================================================
downloaded 2.5 MB

Data saved at /tmp/Rtmp2792cq/dftRoadSafetyData_Vehicles_2017/Veh.csv
Joining, by = "accident_index"
Error: processing vignette 'blog.Rmd' failed with diagnostics:
invalid multibyte string, element 1
--- failed re-building 'blog.Rmd'

--- re-building 'stats19.Rmd' using rmarkdown
trying URL 'http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafetyData_Accidents_2017.zip'
Content type 'application/x-zip-compressed' length 3997883 bytes (3.8 MB)
==================================================
downloaded 3.8 MB

trying URL 'http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafetyData_Vehicles_2017.zip'
Content type 'application/x-zip-compressed' length 2584589 bytes (2.5 MB)
==================================================
downloaded 2.5 MB

trying URL 'http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafetyData_Casualties_2017.zip'
Content type 'application/x-zip-compressed' length 1169376 bytes (1.1 MB)
==================================================
downloaded 1.1 MB

Joining, by = "accident_index"
--- finished re-building 'stats19.Rmd'

SUMMARY: processing the following file failed:
  'blog.Rmd'

Error: Vignette re-building failed.
Execution halted