[Python] Issue with running virtual machines throught virt-manager from pacman

I successfully installed virt-manager through pacman on Parabola GNU/Linux-libre (based on Arch), but there are issues when installing or running a virtual machine. These problems do not occur when using the flatpak version of virt-manager, but I want the pacman version, which isn't working. This is error:

Error launching create dialog: could not get a reference to type class

Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/createvm.py", line 176, in show_instance
cls._instance = vmmCreateVM()
~~~~~~~~~~~^^
File "/usr/share/virt-manager/virtManager/createvm.py", line 248, in __init__
self._init_state()
~~~~~~~~~~~~~~~~^^
File "/usr/share/virt-manager/virtManager/createvm.py", line 380, in _init_state
self._os_list = vmmOSList()
~~~~~~~~~^^
File "/usr/share/virt-manager/virtManager/oslist.py", line 44, in __init__
self._init_state()
~~~~~~~~~~~~~~~~^^
File "/usr/share/virt-manager/virtManager/oslist.py", line 60, in _init_state
all_os = virtinst.OSDB.list_os(sortkey="label")
File "/usr/share/virt-manager/virtinst/osdict.py", line 158, in list_os
self._os_db.get_os_list().get_elements()]
^^^^^^^^^^^
File "/usr/share/virt-manager/virtinst/osdict.py", line 86, in _os_db
return self._os_loader.get_db()
^^^^^^^^^^^^^^^
File "/usr/share/virt-manager/virtinst/osdict.py", line 78, in _os_loader
loader = Libosinfo.Loader()
TypeError: could not get a reference to type class

Continue reading...