snapcraft prints 'architectures' when trying to build a gadget snap

What happens:

yann@imperium:~/dev/snappy/1604/packages/paros_gadget$ snapcraft snap .
'architectures'

What's inside the directory:

yann@imperium:~/dev/snappy/1604/packages/paros_gadget$ find .
.
./meta
./meta/snap.yaml
yann@imperium:~/dev/snappy/1604/packages/paros_gadget$ cat meta/snap.yaml
name: paros
version: 1.0
summary: Paros support package
description: Support files for booting Paros
type: gadget

branding:
  name: Paros drone

gadget:
  software:
    platform: Tegra X1
    architecture: armhf
    partition-layout: minimal
    bootloader: u-boot