agent_genkey failed: Invalid flag

[Patrick Brunschwig]

A user of Enigmail tried to create a key using the following command:

/usr/bin/gpg2 --charset utf-8 --display-charset utf-8 \
--no-auto-check-trustdb --batch --no-tty --no-verbose --status-fd 2 \
--gen-key
%echo Generating key
Key-Type: EDDSA
Key-Curve: Ed25519
Key-Usage: sign
Subkey-Type: ECDH
Subkey-Curve: Curve25519
Subkey-Usage: encrypt
Name-Real: [name]
Name-Email: [email]
Expire-Date: 1825

gpg reports the following error:

gpg: agent_genkey failed: Invalid flag
gpg: key generation failed: Invalid flag
[GNUPG:] ERROR key_generate 16777288
[GNUPG:] KEY_NOT_CREATED

Any idea what could be wrong here?

-Patrick