Running examples in 'refseqR-Ex.R' failed
The error most likely occurred in:

> ### Name: refseq_geneSymbol
> ### Title: Get the gene symbol
> ### Aliases: refseq_geneSymbol
> 
> ### ** Examples
> 
> # Get the gene symbol from a set of XM accessions
> xm = c("XM_004487701", "XM_004488493")
> sapply(xm, function(x) refseq_geneSymbol (x, db = "nuccore"), USE.NAMES = FALSE)
[1] "LOC101512347" "LOC101506901"
> 
> # Get the gene symbol from a set of XP accessions
> xp = c("XP_004487758")
> sapply(xp, function(x) refseq_geneSymbol (x, db = "protein"), USE.NAMES = FALSE)
Warning in check_xml_errors(x) : BLOB ID IS NOT IMPLEMENTED
Warning in check_xml_errors(x) : NCBI C++ Exception:
    Error: UNK_MODULE(CException::eInvalid) "UNK_FILE", line 18446744073709551615: UNK_FUNC --- 

Error: Must specify either (not both) 'id' or 'web_history' arguments
Execution halted
Running examples in ‘refseqR-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: refseq_XPlength
> ### Title: Get the protein length from an XP accession
> ### Aliases: refseq_XPlength
> 
> ### ** Examples
> 
>  # Get the XM ids from a set of XP accessions
>  xp = c("XP_004487758", "XP_004488550")
>  sapply(xp, function(x) refseq_XPlength(x), USE.NAMES = FALSE)
Warning: Esummary includes error message: Invalid uid XP_004488550 at position= 0
Error: No esummary records found in file
Execution halted