I also had this problem and found that I was able to fix it like this: 
my $result = $modemSession->set_request(-varbindlist => ['1.3.6.1.2.1.
+69.1.1.3.0', Net::SNMP::INTEGER, 1]);

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In reply to Re^9: Net::SNMP ASN1 Type error by Anonymous Monk
in thread Net::SNMP ASN1 Type error by jbumsted

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