Error(s) in re-building vignettes:
--- re-building 'photosynthesis-introduction.Rmd' using rmarkdown

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Loading required package: units
udunits system database from D:/temp/Rtmp0KJ9B9/RLIBS_297a013b4cec/units/share/udunits

Attaching package: 'purrr'

The following object is masked from 'package:magrittr':

    set_names

Error in get(name, envir = asNamespace(pkg), inherits = FALSE) : 
  object '.slaveRSOCK' not found
Calls: ::: -> get
Execution halted
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  NAs introduced by coercion
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  NAs introduced by coercion
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  NAs introduced by coercion
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  NAs introduced by coercion
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  NAs introduced by coercion
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  NAs introduced by coercion
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  NAs introduced by coercion
Quitting from lines 136-166 (photosynthesis-introduction.Rmd) 
Error: processing vignette 'photosynthesis-introduction.Rmd' failed with diagnostics:
Failed to launch and connect to R worker on local machine 'localhost' from local machine 'CRANWIN'.
 * The error produced by socketConnection() was: 'reached elapsed time limit' (which suggests that the connection timeout of 120 seconds (argument 'connectTimeout') kicked in)
 * The localhost socket connection that failed to connect to the R worker used port 11298 using a communication timeout of 2592000 seconds and a connection timeout of 120 seconds.
 * Worker launch call: "D:/RCompile/recent/R/bin/x64/Rscript" --default-packages=datasets,utils,grDevices,graphics,stats,methods -e "try(suppressWarnings(cat(Sys.getpid(),file=\"D:/temp/Rtmp8qBUiu/future.parent=86872.1535826353707.pid\")), silent = TRUE)" -e "parallel:::.slaveRSOCK()" MASTER=localhost PORT=11298 OUT=/dev/null TIMEOUT=2592000 XDR=TRUE.
 * Worker (PID 113892) was successfully killed: TRUE
 * Troubleshooting suggestions:
   - Suggestion #1: Set 'verbose=TRUE' to see more details.
   - Suggestion #2: On Windows, output from worker when using 'outfile=NULL' is only visible when running R from a terminal (not a GUI).

--- failed re-building 'photosynthesis-introduction.Rmd'

SUMMARY: processing the following file failed:
  'photosynthesis-introduction.Rmd'

Error: Vignette re-building failed.
Execution halted