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ALSA lib pcm_dsnoop.c:558:(snd_pcm_dsnoop_open) unable to open slave

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pcm.dmixer {
   type dmix
   ipc_key 1024
   slave {
       pcm "hw:0,0"
       period_time 0
       buffer_time 0
       period_size 1024
       buffer_size 8192
  rate 44100
   }
   bindings {
       0 0
       1 1
   }
}

pcm.dsp0 {
   type plug
   slave.pcm "dmixer"
}

pcm.input {
    type dsnoop
    ipc_key 2048
   slave {
       pcm "hw:0,0"
       period_time 0
       buffer_time 0
       period_size 1024
       buffer_size 8192
  rate 44100
   }

bindings {
         0 0
         1 1
    }
}

pcm.asymed {
        type asym
        playback.pcm "dmixer"
        capture.pcm "input"
}
pcm.!default {
       type plug
       slave.pcm "asymed"
}
pcm.default {
  type plug
  slave.pcm "asymed"
}
ctl.mixer0 {
   type hw
   card 0
} 

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# Alsa 0.9.X kernel modules' configuration file.
# $Header: /var/cvsroot/gentoo-x86/media-sound/alsa-utils/files/alsa-modules.conf-rc,v 1.5 2006/06/13 10:18:25 uberlord Exp $

alias /dev/mixer snd-mixer-oss
alias /dev/mixer1 snd-mixer-oss
alias /dev/dsp snd-pcm-oss
alias /dev/dsp1 snd-pcm-oss
alias /dev/midi snd-seq-oss
alias /dev/midi1 snd-seq-oss


#card 0
alias snd-card-0 snd-intel8x0
alias sound-slot-0 snd-intel8x0

alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss 


#card 1
alias snd-card-1 snd-ens1371
alias sound-slot-1 snd-ens1371

alias sound-service-1-0 snd-mixer-oss
alias sound-service-1-1 snd-seq-oss
alias sound-service-1-3 snd-pcm-oss
alias sound-service-1-8 snd-seq-oss
alias sound-service-1-12 snd-pcm-oss 


#options snd-intel8x0 index=1

options snd cards_limit=2

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# --- BEGIN: Generated by ALSACONF, do not edit. ---
# --- ALSACONF version 1.0.13 ---

alias char-major-116 snd
alias char-major-14 soundcore

# CARD 1

alias snd-card-0 snd-ca0106

# OSS/Free portion

alias sound-slot-0 snd-ca0106

alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss

alias /dev/dsp snd-pcm-oss
options snd-ca0106 index=0

# CARD 2

alias snd-card-1 snd-ens1371
alias sound-slot-1 snd-ens1371

alias sound-service-1-0 snd-mixer-oss
alias sound-service-1-3 snd-pcm-oss
alias sound-service-1-12 snd-pcm-oss

alias /dev/dsp1 snd-pcm-oss
options snd-ens1371 index=1

# --- END: Generated by ALSACONF, do not edit. ---

options snd cards_limit=2

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pcm.intel8x0 { type hw card 0 }

ctl.intel8x0 { type hw card 0 }

pcm.ens1371 { type hw card 1 }

ctl.ens1371 { type hw card 1 }


pcm.dsp0 {
    type plug
    slave.pcm "dmix"   # <-- this line has been altered!
}

# mixer0 can stay unchanged, because it isn't used anyway, I guess ;)
ctl.mixer0 {
    type hw
    card 0
}

# I also had to add/alter the following, making ALSA use dmix by default
pcm.!default {
    type plug
    slave.pcm "dmix"
}

pcm.ossmix {
    type dmix
    ipc_key 1024          # must be unique!
    ipc_perm 0660         # sound for everybody (at least in your group)
    slave {
        pcm "hw:0,0"      # you cannot use a "plug" device here, darn.
        period_time 0
        period_size 1024  # must be power of 2
        buffer_size 8192  # dito. It
        #format "S32_LE"
        #periods 128      # dito.
        #rate 8000        # with rate 8000 you *will* hear,
                          # if ossmix is used :)
    }
}
# bindings are cool. This says, that only the first
# two channels are to be used by dmix, which is enough for
# (most) oss apps and also lets multichannel chios work
# much faster:

bindings {
        0 0   # from 0 => to 0
        1 1   # from 1 => to 1
}


pcm.dsp0 {
    type plug
    slave.pcm "ossmix"     # use our new PCM here
}
# mixer0 like above
ctl.mixer0 {
    type hw
    card 0
}

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ALSA lib pcm_dmix.c:803:(snd_pcm_dmix_open) The dmix plugin supports only playback stream