[Bioperl-l] Can't locate Bio/seqIO.pm in @INC

[yusheng liao]

Can't locate Bio/seqIO.pm in @INC 
I try to run a .pl file to get multi sequences for t
he GenBank using the
Bioperl. The following were the error message:
linux:/home/liaoy # perl hsv-1.pl
Can't locate Bio/seqIO.pm in @INC (@INC contains:
/usr/lib/perl5/5.8.7/i586-linux-thread-multi /usr/lib/perl5/5.8.7
/usr/lib/perl5/site_perl/5.8.7/i586-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.7 /usr/lib/perl5/site_perl
/usr/lib/perl5/vendor_perl/5.8.7/i586-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.7 /usr/lib/perl5/vendor_perl .)
 at hsv-1.pl line 4.
BEGIN failed--compilation aborted at hsv-1.pl line 4.

what is the problem? And how to corret it?