Error with "parse_entrez_gene_example.pl Sus_scrofa.ags"

   I am a geen hand in Bioperl. When I run perl with "parse_entrez_gene_example.pl Sus_scrofa.ags", it turned out the error information:
     Data Error: none conforming data found on line 1 in Sus_scrofa.ags.
 
   But the Sus_scrofa.ags is download from NCBI, with the format of ASN1, should be the same as Homo_sapiens in the example. So it should be no error as the code is the example from Mingyi.
   I wonder why this happen, and should I change something about the file?