lacp enable

Hi

I need two ports (TenGig 0/46-47) to be a lag and enable lacp on them.  When I try to enable lacp it says  Error port not in default mode.

Steps I have performed

Enable port channel

*  interface port-channel 1

* no shutdown

* switchport

* channel-member Tengigabitethernet 0/46

* channel-member Tengigabitethernet 0/47

Now to enable lacp

* interface range Tengigabitethernet 0/46-47

* no shutdown

* port-channel-protocol lacp

% Error: Port is not in default mode Te 0/46

% Error: Port is not in default mode Te 0/47

What did I miss?

Thanks

Paras.