vmm hack error: TypeError: expected str, bytes or os.PathLike object, not NoneType
(venv) [15:33] diamond:uncloud% ./bin/uncloud-run-reinstall hack --etcd-host etcd1.ungleich.ch --etcd-ca-cert ~/vcs/ungleich-dot-cdist/files/etcd/ca.pem --etcd-cert-cert ~/vcs/ungleich-dot-cdist/files/etcd/nico.pem --etcd-cert-key ~/vcs/ungleich-dot-cdist/files/etcd/nico-key.pem --create-vm
ERROR:root:expected str, bytes or os.PathLike object, not NoneType
Traceback (most recent call last):
File "./bin/../scripts/uncloud", line 82, in <module>
main(arguments)
File "/home/nico/vcs/uncloud/uncloud/hack/main.py", line 47, in main
vm = VM(config)
File "/home/nico/vcs/uncloud/uncloud/hack/vm.py", line 74, in __init__
self.vmm = VMM(vmm_backend=self.hackprefix)
File "/home/nico/vcs/uncloud/uncloud/vmm/__init__.py", line 109, in __init__
self.socket_dir = os.path.join(self.vmm_backend, "sock")
File "/usr/lib/python3.8/posixpath.py", line 76, in join
a = os.fspath(a)
TypeError: expected str, bytes or os.PathLike object, not NoneType
(venv) [15:41] diamond:uncloud%