Problem at creating connection in virt-manager with qemu/kvm

Hi everybody
I’m a fresh user and have basic knowledge of linux
I installed virt-manager to be able to create virtual machines but when I do creating connection qemu/kvm it stucks on creating connection
I saw this log on details of my only connection below the window:
Error launching host dialog: could not get a reference to type class

Traceback (most recent call last):
File “/usr/share/virt-manager/virtManager/”, line 26, in show_instance
cls._instances[uri] = vmmHost(conn)
File “/usr/share/virt-manager/virtManager/”, line 52, in init
File “/usr/share/virt-manager/virtManager/”, line 133, in _init_storage_state
self._storagelist = vmmHostStorage(self.conn, self.builder, self.topwin)
File “/usr/share/virt-manager/virtManager/”, line 105, in init
File “/usr/share/virt-manager/virtManager/”, line 161, in _init_ui
self._xmleditor = vmmXMLEditor(self.builder, self.topwin,
File “/usr/share/virt-manager/virtManager/”, line 39, in init
File “/usr/share/virt-manager/virtManager/”, line 64, in _init_ui
self._srcview = GtkSource.View()
TypeError: could not get a reference to type class

when I installed virt-manager by zypper install virt-manger it pushed me to install python11 and then in order to fix error I also installed requests package of python to be able to run it
but now I’m facing this error and have no idea how to solve it
any recommendation will be appreciated