Can you make sure that the "_1480_project_loadbalancersv2_panel.py" is not installed in the horizon/openstack-dashboard/enabled directory? Only "_1481_project_ng_loadbalancersv2_panel.py" should be present.
Can you make sure that the "_1480_ project_ loadbalancersv2 _panel. py" is not installed in the horizon/ openstack- dashboard/ enabled directory? Only "_1481_ project_ ng_loadbalancer sv2_panel. py" should be present.