tvheadend error when playing IPTV

[webjib]

I've successfully installed tvheadend and added some IPTV channels from my ISP. However, when I try to play a channel, I've got an error on all channels :

Code:

17:25:52 T:3041374848  NOTICE: COMXPlayer: Opening: pvr://channels/tv/Toutes les chaînes TV/1.pvr
17:25:52 T:3041374848 WARNING: CDVDMessageQueue(player)::Put MSGQ_NOT_INITIALIZED
17:25:52 T:3041374848  NOTICE: CXBMCRenderManager::ResetRenderBuffer - using 5 render buffers
17:25:52 T:2704274496  NOTICE: Thread COMXPlayer start, auto delete: false
17:25:52 T:2704274496  NOTICE: Creating InputStream
17:25:54 T:2704274496  NOTICE: Creating Demuxer
17:25:54 T:2704274496  NOTICE: Opening video stream: 0 source: 256
17:25:54 T:2704274496  NOTICE: Creating video thread
17:25:54 T:2828006464  NOTICE: Thread COMXPlayerVideo start, auto delete: false
17:25:54 T:2704274496  NOTICE: Opening audio stream: 1 source: 256
17:25:54 T:2704274496   ERROR: OMXPlayerAudio : Error open audio output
17:25:54 T:2704274496  NOTICE: Creating audio thread
17:25:54 T:2660209728  NOTICE: Thread COMXPlayerAudio start, auto delete: false
17:25:54 T:2704274496   ERROR: Process - Closing stream due to m_omxPlayerAudio.BadState()

But, same channels are working perfectly on an OPENELEC installation.

Any clue why COMXPlayer can't open my streams?