Error(s) in re-building vignettes:
  ...
--- re-building ‘FFD-tibble-how-to.Rmd’ using rmarkdown

Quitting from FFD-tibble-how-to.Rmd:101-105 [tbl_all]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `open.connection()`:
! cannot open the connection
---
Backtrace:
     ▆
  1. └─FFdownload::FFdownload(...)
  2.   ├─xml2::read_html(URL)
  3.   └─xml2:::read_html.default(URL)
  4.     ├─base::suppressWarnings(...)
  5.     │ └─base::withCallingHandlers(...)
  6.     ├─xml2::read_xml(x, encoding = encoding, ..., as_html = TRUE, options = options)
  7.     └─xml2:::read_xml.character(...)
  8.       └─xml2:::read_xml.connection(...)
  9.         ├─base::open(x, "rb")
 10.         └─base::open.connection(x, "rb")
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'FFD-tibble-how-to.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘FFD-tibble-how-to.Rmd’

--- re-building ‘FFD-xts-how-to.Rmd’ using rmarkdown

Quitting from FFD-xts-how-to.Rmd:58-61 [xts_list_save]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `open.connection()`:
! cannot open the connection
---
Backtrace:
     ▆
  1. └─FFdownload::FFdownload(...)
  2.   ├─xml2::read_html(URL)
  3.   └─xml2:::read_html.default(URL)
  4.     ├─base::suppressWarnings(...)
  5.     │ └─base::withCallingHandlers(...)
  6.     ├─xml2::read_xml(x, encoding = encoding, ..., as_html = TRUE, options = options)
  7.     └─xml2:::read_xml.character(...)
  8.       └─xml2:::read_xml.connection(...)
  9.         ├─base::open(x, "rb")
 10.         └─base::open.connection(x, "rb")
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'FFD-xts-how-to.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘FFD-xts-how-to.Rmd’

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

Quitting from assetpricing.Rmd:54-77 [download]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `open.connection()`:
! cannot open the connection
---
Backtrace:
     ▆
  1. └─FFdownload::FFdownload(...)
  2.   ├─xml2::read_html(URL)
  3.   └─xml2:::read_html.default(URL)
  4.     ├─base::suppressWarnings(...)
  5.     │ └─base::withCallingHandlers(...)
  6.     ├─xml2::read_xml(x, encoding = encoding, ..., as_html = TRUE, options = options)
  7.     └─xml2:::read_xml.character(...)
  8.       └─xml2:::read_xml.connection(...)
  9.         ├─base::open(x, "rb")
 10.         └─base::open.connection(x, "rb")
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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

SUMMARY: processing the following files failed:
  ‘FFD-tibble-how-to.Rmd’ ‘FFD-xts-how-to.Rmd’ ‘assetpricing.Rmd’

Error: Vignette re-building failed.
Execution halted