Pyaudio Device unaviable Error OSError: [Errno -9985] Device unavailable

I am trying to run pvporcupine on ubuntu system, however when I try to execute below code I am getting OSError: [Errno -9985] Device unavailable error. I tried reinstalling and installing its dependencies but still the problem persists.

import pyaudio
import struct
import pvporcupine

access_key = "somekey"
pvporcupine.create(access_key=access_key,keyword_paths=keyword_file_paths, sensitivities=sensitivities )
sensitivities = [0.05]
handle = pvporcupine.create(access_key=access_key, keywords=['computer', 'jarvis','alexa'])

def get_next_audio_frame():
    pa = pyaudio.PyAudio()
    audio_stream = pa.open(rate=48000,channels=1,format=pyaudio.paInt16,input=True,frames_per_buffer=handle.frame_length,input_device_index=None)
    pcm = audio_stream.read(handle.frame_length)
    pcm = struct.unpack_from("h" * handle.frame_length, pcm)
    return pcm

while True:
    pcm = get_next_audio_frame()
    keyword_index = handle.process(pcm)
    if keyword_index>=0:
        print("**********************************************hi")