Error(s) in re-building vignettes:
--- re-building ‘Guide_restorepoint.Rmd’ using knitr
Failed to parse YAML:

output:
  pdf_document: default
  html_document: default
  vignette: >
%\VignetteEngine{knitr::knitr}
 ^~~~~~
%\VignetteIndexEntry{Debugging R with restore points}

Error: processing vignette 'Guide_restorepoint.Rmd' failed with diagnostics:
Scanner error: while scanning a directive at line 5, column 1 could not find expected directive name at line 5, column 2

--- failed re-building ‘Guide_restorepoint.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘Guide_restorepoint.Rmd’ using knitr
Failed to parse YAML:

output:
  pdf_document: default
  html_document: default
  vignette: >
%\VignetteEngine{knitr::knitr}
 ^~~~~~
%\VignetteIndexEntry{Debugging R with restore points}

Error: processing vignette 'Guide_restorepoint.Rmd' failed with diagnostics:
Scanner error: while scanning a directive at line 5, column 1 could not find expected directive name at line 5, column 2

--- failed re-building ‘Guide_restorepoint.Rmd’

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

Error: Vignette re-building failed.
Execution halted