Error(s) in re-building vignettes:
  ...
--- re-building 'riskregression.Rmd' using rmarkdown
Quitting from lines 309-315 (riskregression.Rmd) 
Error: processing vignette 'riskregression.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building 'riskregression.Rmd'

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘riskregression.Rmd’ using rmarkdown
Quitting from lines 309-315 (riskregression.Rmd) 
Error: processing vignette ‘riskregression.Rmd’ failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building ‘riskregression.Rmd’

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

Error: Vignette re-building failed.
Execution halted
installed size is 10.6Mb
  sub-directories of 1Mb or more:
    libs   9.7Mb
Error(s) in re-building vignettes:
--- re-building ‘riskregression.Rmd’ using rmarkdown
OMP: Warning #96: Cannot form a team with 8 threads, using 2 instead.
OMP: Hint Consider unsetting KMP_DEVICE_THREAD_LIMIT (KMP_ALL_THREADS), KMP_TEAMS_THREAD_LIMIT, and OMP_THREAD_LIMIT (if any are set).
Quitting from lines 309-315 (riskregression.Rmd) 
Error: processing vignette 'riskregression.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building ‘riskregression.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building ‘riskregression.Rmd’ using rmarkdown
Quitting from lines 309-315 (riskregression.Rmd) 
Error: processing vignette 'riskregression.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building ‘riskregression.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'riskregression.Rmd' using rmarkdown
Quitting from lines 309-315 (riskregression.Rmd) 
Error: processing vignette 'riskregression.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building 'riskregression.Rmd'

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'riskregression.Rmd' using rmarkdown
Quitting from lines 309-315 (riskregression.Rmd) 
Error: processing vignette 'riskregression.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building 'riskregression.Rmd'

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘riskregression.Rmd’ using rmarkdown
Quitting from lines 309-315 (riskregression.Rmd) 
Error: processing vignette 'riskregression.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building ‘riskregression.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘riskregression.Rmd’ using rmarkdown
Quitting from lines 309-315 (riskregression.Rmd) 
Error: processing vignette 'riskregression.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building ‘riskregression.Rmd’

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

Error: Vignette re-building failed.
Execution halted
installed size is 14.2Mb
  sub-directories of 1Mb or more:
    libs  13.4Mb
installed size is 12.1Mb
  sub-directories of 1Mb or more:
    libs  11.3Mb
Error(s) in re-building vignettes:
--- re-building 'riskregression.Rmd' using rmarkdown
Quitting from lines 309-315 (riskregression.Rmd) 
Error: processing vignette 'riskregression.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building 'riskregression.Rmd'

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

Error: Vignette re-building failed.
Execution halted
installed size is 12.2Mb
  sub-directories of 1Mb or more:
    libs  11.4Mb
Error(s) in re-building vignettes:
--- re-building 'riskregression.Rmd' using rmarkdown
Quitting from lines 309-315 (riskregression.Rmd) 
Error: processing vignette 'riskregression.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building 'riskregression.Rmd'

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

Error: Vignette re-building failed.
Execution halted