Error(s) in re-building vignettes:
  ...
--- re-building ‘simmer-01-introduction.Rmd’ using rmarkdown
--- finished re-building ‘simmer-01-introduction.Rmd’

--- re-building ‘simmer-02-jss.Rmd’ using rmarkdown
Loading required package: ggplot2

Attaching package: 'simmer.plot'

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

    get_mon_arrivals, get_mon_attributes, get_mon_resources

Warning: Removed 15916 rows containing missing values (geom_path).
Warning: Removed 15916 rows containing missing values (geom_path).
Quitting from lines 613-625 (simmer-02-jss.Rmd) 
Error: processing vignette 'simmer-02-jss.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘simmer-02-jss.Rmd’

--- re-building ‘simmer-03-trajectories.Rmd’ using rmarkdown
Loading required package: ggplot2

Attaching package: 'simmer.plot'

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

    get_mon_arrivals, get_mon_attributes, get_mon_resources

Quitting from lines 390-414 (simmer-03-trajectories.Rmd) 
Error: processing vignette 'simmer-03-trajectories.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘simmer-03-trajectories.Rmd’

--- re-building ‘simmer-04-bank-1.Rmd’ using rmarkdown
--- finished re-building ‘simmer-04-bank-1.Rmd’

--- re-building ‘simmer-04-bank-2.Rmd’ using rmarkdown
Quitting from lines 571-598 (simmer-04-bank-2.Rmd) 
Error: processing vignette 'simmer-04-bank-2.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘simmer-04-bank-2.Rmd’

--- re-building ‘simmer-05-simpy.Rmd’ using rmarkdown
--- finished re-building ‘simmer-05-simpy.Rmd’

--- re-building ‘simmer-06-queueing.Rmd’ using rmarkdown
Loading required package: ggplot2

Attaching package: 'simmer.plot'

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

    get_mon_arrivals, get_mon_attributes, get_mon_resources

Quitting from lines 70-78 (simmer-06-queueing.Rmd) 
Error: processing vignette 'simmer-06-queueing.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘simmer-06-queueing.Rmd’

--- re-building ‘simmer-07-ctmc.Rmd’ using rmarkdown
Loading required package: ggplot2

Attaching package: 'simmer.plot'

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

    get_mon_arrivals, get_mon_attributes, get_mon_resources

Quitting from lines 156-161 (simmer-07-ctmc.Rmd) 
Error: processing vignette 'simmer-07-ctmc.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘simmer-07-ctmc.Rmd’

--- re-building ‘simmer-08-philosophers.Rmd’ using rmarkdown
Loading required package: ggplot2

Attaching package: 'simmer.plot'

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

    get_mon_arrivals, get_mon_attributes, get_mon_resources

Quitting from lines 104-114 (simmer-08-philosophers.Rmd) 
Error: processing vignette 'simmer-08-philosophers.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘simmer-08-philosophers.Rmd’

--- re-building ‘simmer-aa-5G.Rmd’ using rmarkdown
--- finished re-building ‘simmer-aa-5G.Rmd’

SUMMARY: processing the following files failed:
  ‘simmer-02-jss.Rmd’ ‘simmer-03-trajectories.Rmd’
  ‘simmer-04-bank-2.Rmd’ ‘simmer-06-queueing.Rmd’ ‘simmer-07-ctmc.Rmd’
  ‘simmer-08-philosophers.Rmd’

Error: Vignette re-building failed.
Execution halted