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NMP-00003:

bad SNMP variable value
Cause: The SNMP program interface received a variable value which has an unsupported data type. This error may occur if a standard SNMP network monitor is sending requests to an Oracle service through an SNMP-to-TNS gateway, and that service cannot understand the requests.
Action: Not normally visible to the user. For further details, turn on tracing and re-execute the failing operation. If the error persists, and occurs when an Oracle control program sends requests to an Oracle service, contact Worldwide Customer Support.