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

Quitting from lines 66-81 [unnamed-chunk-3] (keep_or_drop_nodes.Rmd)
Error: processing vignette 'keep_or_drop_nodes.Rmd' failed with diagnostics:
package or namespace load failed for 'semPlot':
 objects 'crossprod', 'tcrossprod' are not exported by 'namespace:Matrix'
--- failed re-building 'keep_or_drop_nodes.Rmd'

--- re-building 'layout_matrix.Rmd' using rmarkdown

Quitting from lines 48-69 [conceptual_diagram] (layout_matrix.Rmd)
Error: processing vignette 'layout_matrix.Rmd' failed with diagnostics:
package or namespace load failed for 'semPlot':
 objects 'crossprod', 'tcrossprod' are not exported by 'namespace:Matrix'
--- failed re-building 'layout_matrix.Rmd'

--- re-building 'quick_start_cfa.Rmd' using rmarkdown

Quitting from lines 65-72 [unnamed-chunk-5] (quick_start_cfa.Rmd)
Error: processing vignette 'quick_start_cfa.Rmd' failed with diagnostics:
package or namespace load failed for 'semPlot':
 objects 'crossprod', 'tcrossprod' are not exported by 'namespace:Matrix'
--- failed re-building 'quick_start_cfa.Rmd'

--- re-building 'quick_start_sem.Rmd' using rmarkdown

Quitting from lines 69-76 [unnamed-chunk-5] (quick_start_sem.Rmd)
Error: processing vignette 'quick_start_sem.Rmd' failed with diagnostics:
package or namespace load failed for 'semPlot':
 objects 'crossprod', 'tcrossprod' are not exported by 'namespace:Matrix'
--- failed re-building 'quick_start_sem.Rmd'

--- re-building 'second_order.Rmd' using rmarkdown

Quitting from lines 66-74 [unnamed-chunk-5] (second_order.Rmd)
Error: processing vignette 'second_order.Rmd' failed with diagnostics:
package or namespace load failed for 'semPlot':
 objects 'crossprod', 'tcrossprod' are not exported by 'namespace:Matrix'
--- failed re-building 'second_order.Rmd'

--- re-building 'semptools.Rmd' using rmarkdown

Quitting from lines 54-64 [unnamed-chunk-2] (semptools.Rmd)
Error: processing vignette 'semptools.Rmd' failed with diagnostics:
package or namespace load failed for 'semPlot':
 objects 'crossprod', 'tcrossprod' are not exported by 'namespace:Matrix'
--- failed re-building 'semptools.Rmd'

SUMMARY: processing the following files failed:
  'keep_or_drop_nodes.Rmd' 'layout_matrix.Rmd' 'quick_start_cfa.Rmd'
  'quick_start_sem.Rmd' 'second_order.Rmd' 'semptools.Rmd'

Error: Vignette re-building failed.
Execution halted