Can you show us the portion of the configuration where you defined port-channel interface 1. If you haven't done this part:
interface port-channel 5description 'LAG to Other Switch'switchport mode generalno switchport general acceptable-frame-type tagged-onlyswitchport general allowed vlan add 2,4,8 tagged (You define VLAN's you need)
add this to bind the physical ports to the logical LAG port.
Sorry, even with no other vlan but vlan 1, I think you will still need to allow vlan 1 through the virtual LAG port with the vlan allowed statement.