Issues setting up LXD 3.0.1

Still having issues, presumably with storage:

$ lxc launch images:alpine/3.8 a1
Creating a1
Error: Failed container creation: no such file or directory

$ lxc storage show lxc
config:
  source: /media/adrian/btr-store/lxc
  volatile.initial_source: /media/adrian/btr-store/lxc
description: ""
name: lxc
driver: btrfs
used_by:
- /1.0/containers/a1
- /1.0/profiles/default
status: Created
locations:
- none

$ lxc launch images:alpine/3.8 a1
Creating a1
Error: Failed container creation: UNIQUE constraint failed:
    storage_volumes.storage_pool_id,
    storage_volumes.node_id,
    storage_volumes.name,
    storage_volumes.type

Do I need to add these properties manually? The lxc subvolume is owned by my user.