Any interface listed with OK? value "NO" does not have a valid configuration

Interface              IP-Address      OK? Method Status                Protocol
Vlan1                  unassigned      YES NVRAM  administratively down down
Vlan20                 172.29.50.3     YES NVRAM  up                    up
Vlan40                 unassigned      YES unset  up                    up
Vlan41                 172.29.52.34    YES NVRAM  up                    up
GigabitEthernet0/1     unassigned      YES unset  up                    up
GigabitEthernet0/2     unassigned      YES unset  up                    up
GigabitEthernet0/3     unassigned      YES unset  up                    up
GigabitEthernet0/4     unassigned      YES unset  down                  down
GigabitEthernet0/5     unassigned      YES unset  up                    up
GigabitEthernet0/6     unassigned      YES unset  up                    up
GigabitEthernet0/7     unassigned      YES unset  up                    up
GigabitEthernet0/8     unassigned      YES unset  up                    up
Port-channel1          unassigned      YES unset  administratively down down
