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

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: biblioverlap
> ### Title: Document-level matching of bibliographic datasets
> ### Aliases: biblioverlap
> 
> ### ** Examples
> 
> #Example list of input dataframes
> lapply(ufrj_bio_0122, head, n=1)
$Biochemistry
              Lens ID                          DOI
1 000-825-856-704-061 10.1371/journal.pone.0261019
                                                                                                                      Title
1 Hospitalization and ambulatory costs related to breast cancer due to physical inactivity in the Brazilian state capitals.
  Publication Year Source Title                   Author/s Publication Type
1             2022     PloS one Diego Augusto Santos Silva  journal article
  Citing Works Count Open Access Colour
1                  2               gold

$Genetics
              Lens ID                          DOI
1 000-825-856-704-061 10.1371/journal.pone.0261019
                                                                                                                      Title
1 Hospitalization and ambulatory costs related to breast cancer due to physical inactivity in the Brazilian state capitals.
  Publication Year Source Title                   Author/s Publication Type
1             2022     PloS one Diego Augusto Santos Silva  journal article
  Citing Works Count Open Access Colour
1                  2               gold

$Microbiology
              Lens ID                        DOI
1 000-543-947-243-891 10.1007/s12649-022-01682-4
                                                                                                                                  Title
1 Dry Anaerobic Digestion of Food Industry by-Products and Bioenergy Recovery: A Perspective to Promote the Circular Economy Transition
  Publication Year                   Source Title
1             2022 Waste and Biomass Valorization
                                                            Author/s
1 William Gustavo Sganzerla; Miriam Tena-Villares; Luz Selene Buller
  Publication Type Citing Works Count Open Access Colour
1  journal article                  9                   

$Zoology
              Lens ID                       DOI
1 002-158-353-861-555 10.1101/2022.01.08.475494
                                                                                                                                                                 Title
1 Transcriptome-based phylogeny of the semi-aquatic bugs (Hemiptera: Heteroptera: Gerromorpha) reveals patterns of lineage expansion in a series of new adaptive zones
  Publication Year Source Title
1             2022             
                                                         Author/s
1 David Armisén; Séverine Viala; Isabelle da Rocha Silva Cordeiro
  Publication Type Citing Works Count Open Access Colour
1         preprint                  0              green

> 
> #List of columns for matching (identical to biblioverlap()'s defaults)
> matching_cols <- list(DI = 'DOI',
+                       TI = 'Title',
+                       PY = 'Publication Year',
+                       AU = 'Author/s',
+                       SO = 'Source Title')
> 
> #Running document-level matching procedure (first two dataframes)
> biblioverlap_results <- biblioverlap(ufrj_bio_0122[1:2], matching_fields = matching_cols)
Matching by DOI for pair Biochemistry_Genetics
Error in serverSocket(port = port) : 
  creation of server socket failed: port 11199 cannot be opened
Calls: biblioverlap ... doi_matching -> <Anonymous> -> makePSOCKcluster -> serverSocket
Execution halted