关于bioperl的安装，各位牛人帮忙看看这个问题吧～

#/usr/bin/perl -w
use Bio:erl;
# this script will only work with an internet connection
# on the computer it is run on
$seq_object = get_sequence('swissprot',"ROA1_HUMAN";
write_sequence(">roa1.fasta",'fasta',$seq_object);

新安装了bioperl,因此想测试一下是否正常
结果出现这段结果，那位牛人能否解释一下，为什么？谢谢，xp系统下

------------- EXCEPTION  -------------
MSG: swissprot stream with no ID. Not swissprot in my book
STACK Bio::SeqIO::swiss::next_seq C:/Perl/site/lib/Bio\SeqIO\swiss.pm:180
STACK Bio:B::WebDBSeqI::get_Seq_by_id C:/Perl/site/lib/Bio/DB/WebDBSeqI.pm:154

STACK Bio:erl::get_sequence C:/Perl/site/lib/Bio/Perl.pm:513
STACK toplevel bioperl.pl:5

--------------------------------------

问题已经解决。。
谢谢~