ALSA lib pulse.c:243:(pulse_connect) PulseAudio: Unable to connect: Connection refused

I am trying to test CMUSphinx voice recignition engine upon Ubuntu-core 16.04. But I get this Error messages:

ALSA lib pulse.c:243:(pulse_connect) PulseAudio: Unable to connect: Connection refused

Error opening audio device default for capture: Connection refused
FATAL: "continuous.c", line 245: Failed to open audio device

I did test it before with Debian Jessie successfully. But Ubuntu core gives me this Error!