What is this error?

[Glenn Schultz]

Installing the most recent shiny from github produces the following error.  does anyone know what I am missing?  My yahama is in the garage so I pretty sure the motorcycle is not missing

The downloaded binary packages are in

/var/folders/tv/sq6gmnvs13j8jrhkt87f_zmc0000gn/T//Rtmpafc9UN/downloaded_packages

'/Library/Frameworks/R.framework/Resources/bin/R' --vanilla CMD INSTALL  \

  '/private/var/folders/tv/sq6gmnvs13j8jrhkt87f_zmc0000gn/T/Rtmpafc9UN/devtools14eb403fe625/shiny-master'  \

  --library='/Library/Frameworks/R.framework/Versions/3.0/Resources/library' --install-tests 

* installing *source* package 'shiny' ...

** R

** inst

** tests

** preparing package for lazy loading

Error in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]) : 

  namespace 'R6' 1.0.1 is being loaded, but >= 2.0 is required

ERROR: lazy loading failed for package 'shiny'

* removing '/Library/Frameworks/R.framework/Versions/3.0/Resources/library/shiny'

* restoring previous '/Library/Frameworks/R.framework/Versions/3.0/Resources/library/shiny'

Error: Command failed (1)

[Yihui Xie]

As the error message said, you did not have a required version of R6
installed. You may want to run update.packages() occasionally (or
equivalently, click the button Update Packages in RStudio).

Regards,
Yihui