Error(s) in re-building vignettes:
  ...
--- re-building ‘a_introduction.Rmd’ using rmarkdown
Quitting from lines 114-115 (a_introduction.Rmd) 
Error: processing vignette 'a_introduction.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘a_introduction.Rmd’

--- re-building ‘b_time_dependency.Rmd’ using rmarkdown
--- finished re-building ‘b_time_dependency.Rmd’

--- re-building ‘c_homogeneous.Rmd’ using rmarkdown
Scale for 'colour' is already present. Adding another scale for
'colour', which will replace the existing scale.
Quitting from lines 191-198 (c_homogeneous.Rmd) 
Error: processing vignette 'c_homogeneous.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘c_homogeneous.Rmd’

--- re-building ‘d_non_homogeneous.Rmd’ using rmarkdown
Quitting from lines 252-258 (d_non_homogeneous.Rmd) 
Error: processing vignette 'd_non_homogeneous.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘d_non_homogeneous.Rmd’

--- re-building ‘e_probabilistic.Rmd’ using rmarkdown
Quitting from lines 219-220 (e_probabilistic.Rmd) 
Error: processing vignette 'e_probabilistic.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘e_probabilistic.Rmd’

--- re-building ‘f_sensitivity.Rmd’ using rmarkdown
Quitting from lines 190-194 (f_sensitivity.Rmd) 
Error: processing vignette 'f_sensitivity.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘f_sensitivity.Rmd’

--- re-building ‘g_heterogeneity.Rmd’ using rmarkdown
Quitting from lines 177-182 (g_heterogeneity.Rmd) 
Error: processing vignette 'g_heterogeneity.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘g_heterogeneity.Rmd’

--- re-building ‘h_tabular.Rmd’ using rmarkdown
Quitting from lines 145-152 (h_tabular.Rmd) 
Error: processing vignette 'h_tabular.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘h_tabular.Rmd’

--- re-building ‘i_reproduction.Rmd’ using rmarkdown
--- finished re-building ‘i_reproduction.Rmd’

--- re-building ‘j_survival.Rmd’ using rmarkdown
Quitting from lines 204-205 (j_survival.Rmd) 
Error: processing vignette 'j_survival.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘j_survival.Rmd’

--- re-building ‘k_calibration.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

--- finished re-building ‘k_calibration.Rmd’

SUMMARY: processing the following files failed:
  ‘a_introduction.Rmd’ ‘c_homogeneous.Rmd’ ‘d_non_homogeneous.Rmd’
  ‘e_probabilistic.Rmd’ ‘f_sensitivity.Rmd’ ‘g_heterogeneity.Rmd’
  ‘h_tabular.Rmd’ ‘j_survival.Rmd’

Error: Vignette re-building failed.
Execution halted