Error(s) in re-building vignettes:
  ...
--- re-building ‘V01_get_started.Rmd’ using rmarkdown

Quitting from lines 36-40 [unnamed-chunk-2] (V01_get_started.Rmd)
Error: processing vignette 'V01_get_started.Rmd' failed with diagnostics:
no applicable method for 'set_units' applied to an object of class "difftime"
--- failed re-building ‘V01_get_started.Rmd’

--- re-building ‘V02_inputs_preparation_stars.Rmd’ using rmarkdown

Quitting from lines 87-89 [unnamed-chunk-6] (V02_inputs_preparation_stars.Rmd)
Error: processing vignette 'V02_inputs_preparation_stars.Rmd' failed with diagnostics:
no applicable method for 'set_units' applied to an object of class "difftime"
--- failed re-building ‘V02_inputs_preparation_stars.Rmd’

--- re-building ‘V03_inputs_preparation_whitebox.Rmd’ using rmarkdown
sh: 1: /tmp/check-CRAN-regular-hornik/data/R/whitebox/WBT/whitebox_tools: not found
trying URL 'https://www.whiteboxgeo.com/WBT_Linux/WhiteboxTools_linux_amd64.zip'
Content type 'application/zip' length 24581859 bytes (23.4 MB)
==================================================
downloaded 23.4 MB

thread 'main' panicked at whitebox-tools-app/src/tools/hydro_analysis/fill_depressions.rs:368:23:
Error unwrapping 'output'
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'main' panicked at whitebox-tools-app/src/main.rs:72:21:
No such file or directory (os error 2)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'main' panicked at whitebox-tools-app/src/main.rs:72:21:
No such file or directory (os error 2)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'main' panicked at whitebox-tools-app/src/main.rs:72:21:
No such file or directory (os error 2)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'main' panicked at whitebox-tools-app/src/main.rs:72:21:
No such file or directory (os error 2)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'main' panicked at whitebox-tools-app/src/main.rs:72:21:
No such file or directory (os error 2)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
--- finished re-building ‘V03_inputs_preparation_whitebox.Rmd’

SUMMARY: processing the following files failed:
  ‘V01_get_started.Rmd’ ‘V02_inputs_preparation_stars.Rmd’

Error: Vignette re-building failed.
Execution halted