Error(s) in re-building vignettes:
--- re-building ‘monkeys.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Loading required package: ape
Loading required package: Matrix
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starting worker pid=5209 on localhost:11954 at 12:42:35.455
starting worker pid=5210 on localhost:11954 at 12:42:35.476
Loading required package: PhylogeneticEM
Loading required package: ape
Loading required package: PhylogeneticEM
Loading required package: ape
Loading required package: Matrix
Loading required package: Matrix
loaded PhylogeneticEM and set parent environment
loaded PhylogeneticEM and set parent environment
Alpha 0.0131646571083129
Alpha 0.0517168558708096

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  |======================================================================| 100%Alpha 0.203167705710557

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  |======================================================================| 100%There are some equivalent solutions to the set of shifts selected by the BGHlsq method.
There are some equivalent solutions to the set of shifts selected by the BGHlsqraw method.
There are some equivalent solutions to the set of shifts selected by the BGHmlraw method.
Quitting from lines 55-56 (monkeys.Rmd) 
Error: processing vignette 'monkeys.Rmd' failed with diagnostics:
invalid symbol parameter
--- failed re-building ‘monkeys.Rmd’

There were 26 warnings (use warnings() to see them)
--- re-building ‘tutorial.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Loading required package: ape
Loading required package: Matrix
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  no font could be found for family "Arial"
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  no font could be found for family "Arial"
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  no font could be found for family "Arial"
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  no font could be found for family "Arial"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  no font could be found for family "Arial"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
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  no font could be found for family "Arial"
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Warning in doTryCatch(return(expr), name, parentenv, handler) :
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Warning in doTryCatch(return(expr), name, parentenv, handler) :
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Warning in doTryCatch(return(expr), name, parentenv, handler) :
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Quitting from lines 80-81 (tutorial.Rmd) 
Error: processing vignette 'tutorial.Rmd' failed with diagnostics:
invalid symbol parameter
--- failed re-building ‘tutorial.Rmd’

SUMMARY: processing the following files failed:
  ‘monkeys.Rmd’ ‘tutorial.Rmd’

Error: Vignette re-building failed.
Execution halted