[Bioperl-l] EXCEPTION: Bio::Root::Exception

[Silav Bremos]

Hello
I recently installed BioPerl on Ubuntu 10.10 with the Snaptic package manager. 
Install was easy. I tried to run the first tutorial script from:
http://www.bioperl.org/wiki/Bptutorial.pl#Quick_getting_started_scripts
$seq_object = get_sequence('swiss',"ROA1_HUMAN");
write_sequence(">roa1.fasta",'fasta',$seq_object);
I get this error:
------------ EXCEPTION: Bio::Root::Exception -------------
MSG: id does not exist
STACK: Error::throw
STACK: Bio::Root::Root::throw /usr/share/perl5/Bio/Root/Root.pm:368
STACK: Bio::DB::WebDBSeqI::get_Seq_by_id 
/usr/share/perl5/Bio/DB/WebDBSeqI.pm:168
STACK: Bio::Perl::get_sequence /usr/share/perl5/Bio/Perl.pm:523
STACK: tut1.pl:6
Please help me decipher the exception. Perl version is 5.10. Thanks
---Silav