gpgsm batch: cryptic error

[luis.marsano at gmail.com]

Love gnupg.
Recently discovered it can create X.509 certificates.
However, I’m running into difficulties.

>gpgsm --generate-key --batch cert.gpgsm
gpgsm: line 2: error getting signing key by keygrip '(null)': IPC parameter error
gpgsm: error creating certificate request: IPC parameter error <GPG Agent>

>type cert.gpgsm
%dry-run
Key-Type: RSA
Key-Usage: sign, cert
Name-DN: CN=test
Serial: random
Issuer-DN: CN=marsano authority
Expire-Date: 20500101T000000
Signing-Key: &67A48B009F82A4975C4CAD7C3AB2304116B448EC

>gpgsm -K "&67A48B009F82A4975C4CAD7C3AB2304116B448EC"
C:\Users\luism\AppData\Roaming\gnupg\pubring.kbx
------------------------------------------------
           ID: 0x5172A795
          S/N: 58E78DCE286D204B2E66F9F6
       Issuer: /CN=marsano authority
      Subject: /CN=marsano authority
     validity: 2017-04-07 13:02:06 through 2027-04-05 13:02:06
     key type: 2048 bit RSA
    key usage: certSign crlSign
 chain length: unlimited
  fingerprint: 6C:3C:2D:46:F6:1C:77:B5:FE:1B:05:09:90:40:6B:D0:51:72:A7:95

>gpgsm --version
gpgsm (GnuPG) 2.1.20
[⋮]

>gpgconf --check-programs
gpg:OpenPGP:C%3a\Program Files (x86)\GnuPG\bin\gpg.exe:1:1:
gpg-agent:Private Keys:C%3a\Program Files (x86)\GnuPG\bin\gpg-agent.exe:1:1:
scdaemon:Smartcards:C%3a\Program Files (x86)\GnuPG\bin\scdaemon.exe:1:1:
gpgsm:S/MIME:C%3a\Program Files (x86)\GnuPG\bin\gpgsm.exe:1:1:
dirmngr:Network:C%3a\Program Files (x86)\GnuPG\bin\dirmngr.exe:1:1:
pinentry:Passphrase Entry:C%3a\Program Files (x86)\GnuPG\bin\pinentry-basic.exe:1:1:

>systeminfo
Host Name:                 LMM-NOTEBOOK
OS Name:                   Microsoft Windows 10 Education
OS Version:                10.0.14393 N/A Build 14393
OS Manufacturer:           Microsoft Corporation
OS Configuration:          Standalone Workstation
OS Build Type:             Multiprocessor Free
Registered Owner:          luis.marsano at gmail.com
Registered Organization:   Microsoft
Product ID:                00328-00206-31599-AA213
Original Install Date:     8/5/2016, 6:56:44 AM
System Boot Time:          4/8/2017, 6:58:39 PM
System Manufacturer:       Hewlett-Packard
System Model:              HP ENVY dv6 Notebook PC
System Type:               x64-based PC
Processor(s):              1 Processor(s) Installed.
                           [01]: Intel64 Family 6 Model 58 Stepping 9 GenuineIntel ~1200 Mhz
[⋮]
This is the current GnuPG installed recently from the simple installer.
I can’t seem to generate a certificate.
Any idea about this problem?

Thanks.
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