perl snmp set does not work for certain OID

I do:

my $var = new SNMP::Varbind(['1.3.6.1.4.1.43.10.22.1.1.6.1.10', 0, 3]);
my $var = new SNMP::Varbind(['1.3.6.1.4.1.43.10.22.1.1.6.1.10',
'1.3.6.1.4.1.43.10.22.1.1.6.1.10', 3]);
$session->set(var) or die "$session->{ErrorStr}";
(port MACs number for 3Com switch)

And perl only complains: 'Bad variable type at line where i do $session->set'.
The same string for oid '1.3.6.1.2.1.2.2.1.7.10' (port adm stat) works fine.

What is wrong?
Thanks.

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