Error(s) in re-building vignettes:
--- re-building 'parttree-art.Rmd' using rmarkdown
trying URL 'https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG/480px-Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG'

Quitting from parttree-art.Rmd:210-235 [bonzai]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `download.file()`:
! cannot open URL 'https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG/480px-Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG'
---
Backtrace:
    ▆
 1. └─imager::load.image("https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG/480px-Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG")
 2.   └─imager:::wrap.url(file, load.image.internal)
 3.     └─downloader::download(url, file, mode = "wb")
 4.       ├─base::suppressWarnings(download.file(url, method = method, ...))
 5.       │ └─base::withCallingHandlers(...)
 6.       └─utils::download.file(url, method = method, ...)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'parttree-art.Rmd' failed with diagnostics:
cannot open URL 'https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG/480px-Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG'
--- failed re-building 'parttree-art.Rmd'

--- re-building 'parttree-intro.Rmd' using rmarkdown
--- finished re-building 'parttree-intro.Rmd'

SUMMARY: processing the following file failed:
  'parttree-art.Rmd'

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'parttree-art.Rmd' using rmarkdown
trying URL 'https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG/480px-Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG'

Quitting from parttree-art.Rmd:210-235 [bonzai]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `download.file()`:
! cannot open URL 'https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG/480px-Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG'
---
Backtrace:
    ▆
 1. └─imager::load.image("https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG/480px-Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG")
 2.   └─imager:::wrap.url(file, load.image.internal)
 3.     └─downloader::download(url, file, mode = "wb")
 4.       ├─base::suppressWarnings(download.file(url, method = method, ...))
 5.       │ └─base::withCallingHandlers(...)
 6.       └─utils::download.file(url, method = method, ...)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'parttree-art.Rmd' failed with diagnostics:
cannot open URL 'https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG/480px-Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG'
--- failed re-building 'parttree-art.Rmd'

--- re-building 'parttree-intro.Rmd' using rmarkdown
--- finished re-building 'parttree-intro.Rmd'

SUMMARY: processing the following file failed:
  'parttree-art.Rmd'

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'parttree-art.Rmd' using rmarkdown
trying URL 'https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG/480px-Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG'

Quitting from parttree-art.Rmd:210-235 [bonzai]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `download.file()`:
! cannot open URL 'https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG/480px-Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG'
---
Backtrace:
    ▆
 1. └─imager::load.image("https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG/480px-Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG")
 2.   └─imager:::wrap.url(file, load.image.internal)
 3.     └─downloader::download(url, file, mode = "wb")
 4.       ├─base::suppressWarnings(download.file(url, method = method, ...))
 5.       │ └─base::withCallingHandlers(...)
 6.       └─utils::download.file(url, method = method, ...)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'parttree-art.Rmd' failed with diagnostics:
cannot open URL 'https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG/480px-Japanese_Zelkova_bonsai_16%2C_30_April_2012.JPG'
--- failed re-building 'parttree-art.Rmd'

--- re-building 'parttree-intro.Rmd' using rmarkdown
--- finished re-building 'parttree-intro.Rmd'

SUMMARY: processing the following file failed:
  'parttree-art.Rmd'

Error: Vignette re-building failed.
Execution halted