I am configuring my RouterBoard and have run into a problem on step 16:

[admin@K7QOG-Paine] /ip dhcp-client> add add-default-route=yes dhcp-options=hostname,clientid disabled=no interface=wlan1
failure: dhcp-client on that interface already exists

What do I need to do to be able to proceed?

Thank You,
Erik (K7QOG)