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

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

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

--- re-building ‘concept_lattice.Rmd’ using rmarkdown

Quitting from concept_lattice.Rmd:241-244 [unnamed-chunk-21]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error:
! The package 'ggraph' is required for plotting the lattice.
Please install it using: install.packages('ggraph')
---
Backtrace:
    ▆
 1. └─fc_planets$concepts$plot()
 2.   └─fcaR::lattice_plot(...)
 3.     └─fcaR:::check_needed_pkg("ggraph", "plotting the lattice")
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'concept_lattice.Rmd' failed with diagnostics:
The package 'ggraph' is required for plotting the lattice.
Please install it using: install.packages('ggraph')
--- failed re-building ‘concept_lattice.Rmd’

--- re-building ‘conceptual-scaling.Rmd’ using rmarkdown
--- finished re-building ‘conceptual-scaling.Rmd’

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

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

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

--- re-building ‘fuzzy_fca.Rmd’ using rmarkdown

Quitting from fuzzy_fca.Rmd:123-125 [plot]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error:
! The package 'ggraph' is required for plotting the lattice.
Please install it using: install.packages('ggraph')
---
Backtrace:
    ▆
 1. └─fc$concepts$plot(mode = "reduced", method = "sugiyama")
 2.   └─fcaR::lattice_plot(...)
 3.     └─fcaR:::check_needed_pkg("ggraph", "plotting the lattice")
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'fuzzy_fca.Rmd' failed with diagnostics:
The package 'ggraph' is required for plotting the lattice.
Please install it using: install.packages('ggraph')
--- failed re-building ‘fuzzy_fca.Rmd’

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

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

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

--- re-building ‘lattice_visualization.Rmd’ using rmarkdown

Quitting from lattice_visualization.Rmd:41-43 [basic_plot]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error:
! The package 'ggraph' is required for plotting the lattice.
Please install it using: install.packages('ggraph')
---
Backtrace:
    ▆
 1. └─fc$concepts$plot()
 2.   └─fcaR::lattice_plot(...)
 3.     └─fcaR:::check_needed_pkg("ggraph", "plotting the lattice")
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'lattice_visualization.Rmd' failed with diagnostics:
The package 'ggraph' is required for plotting the lattice.
Please install it using: install.packages('ggraph')
--- failed re-building ‘lattice_visualization.Rmd’

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

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

SUMMARY: processing the following files failed:
  ‘concept_lattice.Rmd’ ‘fuzzy_fca.Rmd’ ‘lattice_visualization.Rmd’

Error: Vignette re-building failed.
Execution halted