Installation Problems with the O Matrix Voice

upon installing the Voice at the last-step I always get:

Error opening audio device mic_channel8 for capture: No such File or directory
FATAL: “pocketsphinx_demo.crp”, line 158: Failed to open audio device

although all microphones are installed, the demos work fine too.

What schould I do?
Thank you for your Help

Can you specify what guide are you following?
Also can you please share more outputs from the error?