Vignette to package not working

[thokall]

The vignette that is part of the package is not working, even though the package is installed as described in the original readme.

SessionInfo:

R version 3.6.2 (2019-12-12)
Platform: x86_64-redhat-linux-gnu (64-bit)
Running under: Fedora 31 (Workstation Edition)

Matrix products: default
BLAS/LAPACK: /usr/lib64/R/lib/libRblas.so

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=sv_SE.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=sv_SE.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=sv_SE.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=sv_SE.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] swedishbirdrecoveries_0.1.7 dplyr_0.8.4                

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.3        compiler_3.6.2    pillar_1.4.3      prettyunits_1.1.1
 [5] remotes_2.1.1     tools_3.6.2       testthat_2.3.1    digest_0.6.25    
 [9] pkgbuild_1.0.6    pkgload_1.0.2     memoise_1.1.0     tibble_2.1.3     
[13] pkgconfig_2.0.3   rlang_0.4.4       cli_2.0.2         curl_4.3         
[17] stringr_1.4.0     xml2_1.2.2        withr_2.1.2       httr_1.4.1       
[21] vctrs_0.2.3       desc_1.2.0        fs_1.3.1          devtools_2.2.2   
[25] hms_0.5.3         rprojroot_1.3-2   tidyselect_1.0.0  glue_1.3.1       
[29] R6_2.4.1          processx_3.4.2    fansi_0.4.1       tcltk_3.6.2      
[33] sessioninfo_1.1.1 callr_3.4.2       purrr_0.3.3       readr_1.3.1      
[37] magrittr_1.5      backports_1.1.5   ps_1.3.2          ellipsis_0.3.0   
[41] usethis_1.5.1     rvest_0.3.5       assertthat_0.2.1  stringi_1.4.6    
[45] crayon_1.3.4