[Freeswitch-users] how to record the conference manually?

Hi,everyone. new to play with freeswitch. i have setup freeswitch and can call each other very well. now, a conference 3002 with several users in it. i want to record 3002 manually, but can't get the way. i have try fs_cli use the command: conference 3002 record /tmp/foo.wav it response: conference 3002 not found any clue? thanks in advance!