don't understand bless

lepetitalbert has asked for the wisdom of the Perl Monks concerning the following question:

dear Monks,

After a couple of hours reading stuff about 'bless' due to a

Can't call method "Workbooks" on unblessed reference
[download]

I still don't understand.

the error come from the last line :

my $excel_template = $file_sys_path . $invoice_page_name;


my $Excel = Win32::OLE->GetActiveObject('Excel.Application') or Win32:
+:OLE->new('Excel.Application', 'Quit') or die "Could not start excel"
+;

$Excel->{'Visible'}     = 0;
$Excel->{DisplayAlerts} = 0;

my $book = $Excel->Workbooks->Open( $excel_template ) or die ; # open 
+Excel file
[download]

I have no idea about what I have to bless : $book, $Excel or $excel_template.

Any hint is welcome

Have a nice day

"There is only one good, namely knowledge, and only one evil, namely ignorance." Socrates

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