checking re-building of vignette outputs ... [30s/54s] WARNING
Error(s) in re-building vignettes:
  ...
--- re-building ‘icons.Rmd’ using rmarkdown
--- finished re-building ‘icons.Rmd’

--- re-building ‘skating_analysis.Rmd’ using rmarkdown
Quitting from lines 98-125 (skating_analysis.Rmd) 
Error: processing vignette 'skating_analysis.Rmd' failed with diagnostics:
initial value in ‘vmmin’ is not finite
--- failed re-building ‘skating_analysis.Rmd’

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

--- re-building ‘hyper2.Rnw’ using Sweave
Loading required package: cubature
--- finished re-building ‘hyper2.Rnw’

--- re-building ‘integration.Rnw’ using Sweave
--- finished re-building ‘integration.Rnw’

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

Error: Vignette re-building failed.
Execution halted