Can't build gateway-os

Hi,
I’m trying to build gateway-os with hostapd, and I am following the instructions here:
https://www.loraserver.io/lora-gateway-os/community/source/

I get the following error and I can’t find any hints online:
yocto@bf1a8ad2e519:/build$ bitbake lora-gateway-os-base
Loading cache: 100% |##############################################################################################################################################| Time: 0:00:01
Loaded 3122 entries from dependency cache.
NOTE: Resolving any missing task queue dependencies

Build Configuration:
BB_VERSION = “1.40.0”
BUILD_SYS = “x86_64-linux”
NATIVELSBSTRING = “ubuntu-18.04”
TARGET_SYS = “arm-oe-linux-gnueabi”
MACHINE = “raspberrypi3”
DISTRO = “lora-gateway-os”
DISTRO_VERSION = “2.0.0test4”
TUNE_FEATURES = “arm armv7ve vfp thumb neon vfpv4 callconvention-hard cortexa7”
TARGET_FPU = “hard”
meta
meta-raspberrypi = “master:3a3d149e76aad117ec257fed7831a570b0b14b0e”
meta-raspberrypi = “HEAD:c71d79efc5a06a0c896c278c94f5b14413bb4d69”
meta-tools
meta-semtech
meta-loraserver = “master:3a3d149e76aad117ec257fed7831a570b0b14b0e”
meta-mender-core = “HEAD:2d06589a3f8dd2804bec828e53a6883fe3532b61”
meta-networking
meta-filesystems
meta-python
meta-oe = “HEAD:4cd3a39f22a2712bfa8fc657d09fe2c7765a4005”
meta = “HEAD:7b5a069d4f11e36a1c407c4212aba5aafaf4ee7f”

Initialising tasks: 100% |#########################################################################################################################################| Time: 0:00:05
Sstate summary: Wanted 1193 Found 0 Missed 1193 Current 51 (0% match, 4% complete)
NOTE: Executing SetScene Tasks
NOTE: Executing RunQueue Tasks
ERROR: Worker process (5245) exited unexpectedly (-9), shutting down…
WARNING: /lora-gateway-os/bitbake/lib/bb/runqueue.py:1298: ResourceWarning: unclosed file <_io.BufferedWriter name=15>
self.worker = {}

NOTE: Sending SIGTERM to remaining 1 tasks
NOTE: Tasks Summary: Attempted 579 tasks of which 578 didn’t need to be rerun and all succeeded.

Summary: There was 1 WARNING message shown.
Summary: There was 1 ERROR message shown, returning a non-zero exit code.

Anyone encountered this before and has any tips on how to resolve this issue?