Error(s) in re-building vignettes:
  ...
--- re-building ‘mixComp.Rmd’ using rmarkdown
Quitting from lines 335-346 (mixComp.Rmd) 
Error: processing vignette ‘mixComp.Rmd’ failed with diagnostics:
The matrix squareroot of the estimated covariance matrix could not be inverted: singular system.
--- failed re-building ‘mixComp.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘mixComp.Rmd’ using rmarkdown
Quitting from lines 335-346 (mixComp.Rmd) 
Error: processing vignette ‘mixComp.Rmd’ failed with diagnostics:
The matrix squareroot of the estimated covariance matrix could not be inverted: singular system.
--- failed re-building ‘mixComp.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building ‘mixComp.Rmd’ using rmarkdown
Quitting from lines 335-346 (mixComp.Rmd) 
Error: processing vignette 'mixComp.Rmd' failed with diagnostics:
The matrix squareroot of the estimated covariance matrix could not be inverted: singular system.
--- failed re-building ‘mixComp.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building ‘mixComp.Rmd’ using rmarkdown
Quitting from lines 335-346 (mixComp.Rmd) 
Error: processing vignette 'mixComp.Rmd' failed with diagnostics:
The matrix squareroot of the estimated covariance matrix could not be inverted: singular system.
--- failed re-building ‘mixComp.Rmd’

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

Error: Vignette re-building failed.
Execution halted