Error(s) in re-building vignettes:
--- re-building 'quick-start.Rmd' using rmarkdown
File output_timepoints/exp_v_obs_scatter.png not found in resource path
Error: processing vignette 'quick-start.Rmd' failed with diagnostics:
pandoc document conversion failed with error 99
--- failed re-building 'quick-start.Rmd'

--- re-building 'timepoint-example.Rmd' using rmarkdown
Warning in get_engine(options$engine) :
  Unknown language engine 'reval' (must be registered via knit_engines$set()).
File output_timepoints/exp_v_obs_scatter.png not found in resource path
Error: processing vignette 'timepoint-example.Rmd' failed with diagnostics:
pandoc document conversion failed with error 99
--- failed re-building 'timepoint-example.Rmd'

--- re-building 'treatment_example.Rmd' using rmarkdown
File output_treatment/exp_v_obs_scatter.png not found in resource path
Error: processing vignette 'treatment_example.Rmd' failed with diagnostics:
pandoc document conversion failed with error 99
--- failed re-building 'treatment_example.Rmd'

SUMMARY: processing the following files failed:
  'quick-start.Rmd' 'timepoint-example.Rmd' 'treatment_example.Rmd'

Error: Vignette re-building failed.
Execution halted