"Encryption support not enabled" when using snmptrap.exe

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I have windows 10 pro. I am trying to use snmptrap.exe to send out an SNMP trap. V2c traps work fine. I get errors when I try to send out v3 traps.

Partial command line:

snmptrap.exe -m ALL -M "C:/Program Files/Hitachi/Protector/bin\..\db\config\mibs" -v3 -n "" -a SHA -A mypassword -x AES -X mypassword -l authPriv -u traptest -e 0x8000000001020308 localhost:163 ""

When I try DES, I get

Encryption support not enabled. (3)

When I try AES, I get

Invalid privacy protocol specified after -3x flag: AES

Not sure where to begin. Haven't been able to find anything helpful online.

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user3407352 On BEST ANSWER

It turns out that whoever built snmptrap.exe built it without encryption support. Never knew that was an option.

The stuff I found online said that this message was caused by a problem in the OS. That is what the error message meant to me. The error message is at best ambiguous and should be made more clear.