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### Running command:
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###   /Library/Frameworks/R.framework/Resources/bin/R CMD build --keep-empty-dirs --no-resave-data MsExperiment
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* checking for file ‘MsExperiment/DESCRIPTION’ ... OK
* preparing ‘MsExperiment’:
* checking DESCRIPTION meta-information ... OK
* installing the package (it is needed to build vignettes)
* creating vignettes ... ERROR
--- re-building ‘MsExperiment.Rmd’ using rmarkdown

Quitting from MsExperiment.Rmd:79-84 [px]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `open.connection()`:
! cannot open the connection
---
Backtrace:
    ▆
 1. └─rpx::PXDataset("PXD022816")
 2.   └─rpx:::list_files(ftp_url)
 3.     └─curl::curl(url = ftp_url, "r", handle = list_files)
 4.       └─curl:::curl_connection(url, open, handle)
 5.         ├─base::withCallingHandlers(...)
 6.         ├─base::open(con, open = mode)
 7.         └─base::open.connection(con, open = mode)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'MsExperiment.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘MsExperiment.Rmd’

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

Error: Vignette re-building failed.
Execution halted