[Bioperl-l] Why cannot I get sequences for some entries?

[cacaucenturion2]

Hi all, 

I tried 

my $seq = $gb->get_Seq_by_gi('162138530');
                print $seq->seq."\n";

I am sure that the sequence whose GI is 162138530 does exist in the database (http://www.ncbi.nlm.nih.gov/protein/162138543). However, no sequences could be given. Has anyone encountered the similar problem? Thanks.

Sincerely yours,
Cacau