ALSA: cannot open audio device

anita@anita-laptop:~$ hydrogen
lash_open_socket: could not connect to host 'localhost', service '14541'
lash_comm_connect_to_server: could not create server connection
lash_open_socket: could not connect to host 'localhost', service '14541'
lash_comm_connect_to_server: could not create server connection
lash_open_socket: could not connect to host 'localhost', service '14541'
lash_comm_connect_to_server: could not create server connection
lash_open_socket: could not connect to host 'localhost', service '14541'
lash_comm_connect_to_server: could not create server connection
lash_open_socket: could not connect to host 'localhost', service '14541'
lash_comm_connect_to_server: could not create server connection
lash_open_socket: could not connect to host 'localhost', service '14541'
lash_comm_connect_to_server: could not create server connection
lash_init: could not connect to server 'localhost' - disabling LASH
Warning: no locale found: /usr/share/hydrogen/data/i18n/hydrogen.en_CA.UTF-8
Warning: error loading locale: /usr/share/hydrogen/data/i18n/hydrogen.en_CA.UTF-8.qm

Hydrogen 0.9.3 [Jan  6 2008]  [http://www.hydrogen-music.org]
Copyright 2002-2005 Alessandro Cominu


Compiled modules:  (FLAC) (LASH) (Jack) (Alsa) (OSS) (LRDF)

Hydrogen comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions. See the file COPYING for details

Using data path: /usr/share/hydrogen/data
ALSA lib pcm_dmix.c:874:(snd_pcm_dmix_open) unable to open slave
[WARNING]   SongReader   	[readSong] Trying to load a song created with a different version of hydrogen.
[WARNING]   SongReader   	[readSong] Song [/usr/share/hydrogen/data/demo_songs/GM_kit_demo1.h2song] saved with version 0.9.0
[LadspaFX::getLadspaFXGroup]
[ERROR]     AlsaAudioDriver   	ALSA: cannot open audio device hw:0: Device or resource busy
[ERROR]     AlsaAudioDriver   	ALSA: cannot open audio device default: Device or resource busy
[ERROR]     Hydrogen      	[audioEngine_startAudioDrivers] Error starting audio driver [audioDriver::connect()]
[ERROR]     Hydrogen      	[audioEngine_startAudioDrivers] Using the NULL output audio driver
[ERROR]     Hydrogen      	[audioEngine_startAudioDrivers] m_pMainBuffer_L == NULL
[ERROR]     Hydrogen      	[audioEngine_startAudioDrivers] m_pMainBuffer_R == NULL
[ERROR]     Hydrogen      	[audioEngine_setupLadspaFX] nBufferSize=0
[ERROR]     NullDriver   	[setBpm] not implemented yet

anita@anita-laptop:~$