While encoding the variable bindings of an SNMP PDU, the SNMP Query Engine expected the syntax of the variable to be 1 (number), 2 (string), 3 (object ID), 4 (empty), 5 (internet address), 6 (counter), 7 (gauge), 8 (time-ticks), or 9 (opaque). Instead, the variable had the indicated syntax. The SNMP PDU is discarded.