loaded the Generic plugin 
ALSA lib conf.c:4630:(snd_config_expand) Unknown parameters 0
ALSA lib control.c:882:(snd_ctl_open_noupdate) Invalid CTL default:0
ortp-warning-Could not attach mixer to card: Invalid argument
ALSA lib conf.c:4630:(snd_config_expand) Unknown parameters 1
ALSA lib control.c:882:(snd_ctl_open_noupdate) Invalid CTL default:1
ortp-warning-Could not attach mixer to card: Invalid argument
ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_open) unable to open slave
terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_S_construct null not valid