ardour problem with qjackctl

I'm new to ubuntu studio. tried Ardour 3 with m-audio fastrack soundcard. It worked at first but now, every time I load Ardour, I get the following message:
[INFO]: LV2: Discovering 266 plugins
[INFO]: Loading menus from /etc/ardour3/ardour.menus
[INFO]: Loaded mixer bindings from /etc/ardour3/mixer.bindings
[ERROR]: JACK: jack_port_set_name: deprecated
[ERROR]: JACK: jack_port_set_name: deprecated
[INFO]: Loading bindings from /etc/ardour3/mnemonic-us.bindings
OSC @ osc.udp://kevin-G5460uk:3819/
[INFO]: Loading 87 MIDI patches from /home/kevin/.config/ardour3/patchfiles:/usr/share/ardour3/patchfiles
[INFO]: Loading history from /media/kevin/SAMSUNG/test1/test1.history

Could anybody help? I would be very grateful