[Bioperl-l] One letter protein sequence to three letters

[Antony03]

Hi!

I wan't to parse a blastp output for have an hsp with three letters code. I
try with this:

my $query1_in  = Bio::SeqIO->newFh ( -file   => "$infile1",
  				    -format => 'fasta' );
 my $query1 = <$query1_in>; 
 my $query2_in  = Bio::SeqIO->newFh ( -file   => "$infile2", 
  				      -format => 'fasta' );
 my $query2 = <$query2_in>; 
 
 my $factory = Bio::Tools::Run::StandAloneBlast->new('program'  => "$algo");
 my $report = $factory->bl2seq($query1, $query2);

############################################################################################################
 while (my $result = $report->next_result) {  # while 1
    print "Query: ".$result->query_name."\n\n";
    while (my $hit = $result->next_hit) {     # while 2
 	while (my $hsp = $hit->next_hsp) {    # while 3
 
if ( $hsp->percent_identity >= "$identity" ) 

	{ # start of if
	
	$qseq = $hsp->query_string;
	$polypeptide_3char = Bio::SeqUtils->seq3($qseq);

	print $polypeptide_3char;

	
		
}
 	} # end of while 3
    print "\n";
    }	# end of while 2
 }	# end of while 3

And I got this error:

------------- EXCEPTION: Bio::Root::Exception -------------
MSG: Not a Bio::PrimarySeqI object but [$self]
STACK: Error::throw
STACK: Bio::Root::Root::throw /usr/share/perl5/Bio/Root/Root.pm:472
STACK: Bio::SeqUtils::seq3 /usr/share/perl5/Bio/SeqUtils.pm:187
STACK: blast_parsing.pl:36
-----------------------------------------------------------
I don't understand why my code generate this error!

Thanks :)
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