bioperl 1.6.9 version is installed in my system..
its not the reason bcs blast is working fine when i am blasting with
follwing code..
#!usr/bin/perl -w
use Bio::Perl;
$seq = get_sequence('NCBI',"NM_181451");
$blast_result=blast_sequence($seq);
write_blast(">xyz.blast",$blast_result);
Manju