Check process probably crashed or hung up for 20 minutes ... killed
Most likely this happened in the example checks (?),
if not, ignore the following last lines of example output:
> cleanEx()
> nameEx("profilelikelihood")
> ### * profilelikelihood
> 
> flush(stderr()); flush(stdout())
> 
> ### Name: profilelikelihood
> ### Title: Profile the likelihood surface of Julia mixed effects models
> ### Aliases: profilelikelihood
> 
> ### ** Examples
> 
> 
> 
> 
> ### * <FOOTER>
> ###
> cleanEx()
> options(digits = 7L)
> base::cat("Time elapsed: ", proc.time() - base::get("ptime", pos = 'CheckExEnv'),"\n")
Time elapsed:  0.55 0.14 4.25 NA NA 
> grDevices::dev.off()
null device 
          1 
> ###
> ### Local variables: ***
> ### mode: outline-minor ***
> ### outline-regexp: "\\(> \\)?### [*]+" ***
> ### End: ***
> quit('no')
======== End of example output (where/before crash/hang up occured ?) ========

Found the following Rd file(s) with Rd \link{} targets missing package
anchors:
  multiple_netfacs_network.Rd: igraph, tbl_graph
  multiple_network_plot.Rd: ggraph
Please provide package anchors for all Rd \link{} targets not in the
package itself and the base packages.
Found the following Rd file(s) with Rd \link{} targets missing package
anchors:
  multiple_netfacs_network.Rd: igraph, tbl_graph
  multiple_network_plot.Rd: ggraph
Please provide package anchors for all Rd \link{} targets not in the
package itself and the base packages.
Error(s) in re-building vignettes:
--- re-building ‘netfacs_tutorial.Rmd’ using rmarkdown

Quitting from netfacs_tutorial.Rmd:101-129 [netfacs]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `.check_ncores()`:
! 23 simultaneous processes spawned
---
Backtrace:
    ▆
 1. └─NetFACS::netfacs(...)
 2.   └─parallel::mclapply(...)
 3.     └─parallel:::.check_ncores(cores)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'netfacs_tutorial.Rmd' failed with diagnostics:
23 simultaneous processes spawned
--- failed re-building ‘netfacs_tutorial.Rmd’

SUMMARY: processing the following file failed:
  ‘netfacs_tutorial.Rmd’

Error: Vignette re-building failed.
Execution halted
Found the following Rd file(s) with Rd \link{} targets missing package
anchors:
  multiple_netfacs_network.Rd: igraph, tbl_graph
  multiple_network_plot.Rd: ggraph
Please provide package anchors for all Rd \link{} targets not in the
package itself and the base packages.
Found the following Rd file(s) with Rd \link{} targets missing package
anchors:
  multiple_netfacs_network.Rd: igraph, tbl_graph
  multiple_network_plot.Rd: ggraph
Please provide package anchors for all Rd \link{} targets not in the
package itself and the base packages.