Running examples in ‘RWsearch-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: archivedb
> ### Title: CRAN archive (CRAN-archive.html + archivedb)
> ### Aliases: archivedb archivedb_down archivedb_load archivedb_npkgs
> ###   archivedb_pkgs archivedb_rempkgs archivedb_list p_downarch
> 
> ### ** Examples
> 
> ### DOWNLOAD archivedb AND COMPARE IT WITH crandb.
> ## In real life, download archivedb and crandb from CRAN
> ## with the functions archivedb_down() and crandb_down().  
> ## In this example, we load two small files (50 and 43 packages).
> 
> crandb_load(system.file("data", "zcrandb.rda", package = "RWsearch"))
$newfile
[1] "crandb loaded. 50 packages listed between 2013-08-04 and 2019-02-10"

> archivedb_load(system.file("aabb", "zCRAN-archive.html", package = "RWsearch")) 
archivedb loaded in .GlobalEnv. 43 listed.
> archivedb_npkgs()
   pcrandb parchivedb     pfirst   pupdated   premoved 
        50         43         12         38          5 
> 
> lst <- archivedb_list()
Breakdown of packages in crandb and archivedb:
   pcrandb parchivedb     pfirst   pupdated   premoved 
        50         43         12         38          5 
> lapply(lst, tail)
$pkgs_crandb
[1] "titrationCurves" "uptasticsearch"  "VetResearchLMM"  "websearchr"     
[5] "wfindr"          "zoo"            

$pkgs_archivedb
[1] "zoo"      "zFactor"  "zicounts" "zmatrix"  "zonator"  "zstdr"   

$pkgs_first
[1] "renpow"           "rpcdsearch"       "sbioPN"           "spectralAnalysis"
[5] "titrationCurves"  "wfindr"          

$pkgs_updated
[1] "tensorflow"     "tfestimators"   "uptasticsearch" "VetResearchLMM"
[5] "websearchr"     "zoo"           

$pkgs_removed
[1] "zFactor"  "zicounts" "zmatrix"  "zonator"  "zstdr"   

$dfr_crandb
           Package  Published
45 titrationCurves 2016-02-11
46  uptasticsearch 2019-01-30
47  VetResearchLMM 2018-04-22
48      websearchr 2018-10-23
49          wfindr 2016-07-03
50             zoo 2018-09-19

$dfr_archivedb
    Package   Archived
38      zoo 2019-03-21
39  zFactor 2019-03-01
40 zicounts 2008-04-23
41  zmatrix 2008-02-16
42  zonator 2019-03-15
43    zstdr 2019-01-11

$dfr_first
            Package  Published
34           renpow 2018-05-16
35       rpcdsearch 2016-01-18
37           sbioPN 2014-03-15
42 spectralAnalysis 2018-06-12
45  titrationCurves 2016-02-11
49           wfindr 2016-07-03

$dfr_updated
          Package  Published
43     tensorflow 2018-11-19
44   tfestimators 2018-11-07
46 uptasticsearch 2019-01-30
47 VetResearchLMM 2018-04-22
48     websearchr 2018-10-23
50            zoo 2018-09-19

$dfr_removed
    Package   Archived
39  zFactor 2019-03-01
40 zicounts 2008-04-23
41  zmatrix 2008-02-16
42  zonator 2019-03-15
43    zstdr 2019-01-11

$npkgs
   pcrandb parchivedb     pfirst   pupdated   premoved 
        50         43         12         38          5 

> range(lst$dfr_removed$Archived)
[1] "2008-02-16" "2019-03-15"
> hist(lst$dfr_removed$Archived, breaks = 15, freq = TRUE, las = 1)
> 
> ## Download the latest tar.gz version from CRAN archive 
> ## (this works for both both existing and removed packages).
> p_downarch(fitur, zmatrix, dir = file.path(tempdir(), "pdownarch"))
Warning in utils::download.file(urlp, destfile, method = "libcurl", quiet = TRUE,  :
  URL 'https://cran.r-project.org/src/contrib/Archive/fitur': status was 'Couldn't connect to server'
Error in utils::download.file(urlp, destfile, method = "libcurl", quiet = TRUE,  : 
  cannot open URL 'https://cran.r-project.org/src/contrib/Archive/fitur'
Calls: p_downarch -> <Anonymous>
Execution halted