Package required but not available: 'taxize'

See section 'The DESCRIPTION file' in the 'Writing R Extensions'
manual.
Running examples in ‘occCite-Ex.R’ failed
The error most likely occurred in:

> ### Name: studyTaxonList
> ### Title: Study Taxon List
> ### Aliases: studyTaxonList
> 
> ### ** Examples
> 
> ## Inputting a vector of taxon names
> studyTaxonList(
+   x = c(
+     "Buteo buteo",
+     "Buteo buteo hartedi",
+     "Buteo japonicus"
+   ),
+   datasources = c("National Center for Biotechnology Information")
+ )
Error in curl::curl_fetch_memory(url, handle = handle) : 
  SSL certificate problem: certificate has expired
Calls: studyTaxonList ... request_fetch -> request_fetch.write_memory -> <Anonymous>
Execution halted