Error in from_file: Expecting value: line 1 column 1 (char 0)

[lionnet1981]

Could someone please check my code to see if it's correct? I've tried multiple approaches, but I'm still encountering errors. I think I'm not familiar with the Vosk WebSocket format, which is why the error persists.
my dialplan:
[outgoing]
exten => 100,1,Answer()
same => n,MixMonitor(/tmp/${UNIQUEID}.wav,r)
same => n,BackGroundDetect(welcome-8khz,1000,500)
same => n,BackGroundDetect(silence/5,1000,500)
same => n,BackGroundDetect(did_not_understand-8khz,1000,500)
same => n,BackGroundDetect(silence/5,1000,500)
same => n,BackGroundDetect(did_not_understand-8khz,1000,500)
same => n,WaitExten(2)

exten => talk,1,Noop(Talk detection completed....)
same => n,StopMixMonitor()
same => n,System(sox /tmp/${UNIQUEID}.wav /tmp/${UNIQUEID}-1.wav silence 1 0.1 1%)
same => n,AGI(speech_to_text.py,/tmp/${UNIQUEID}-1)
same => n,Noop(The Intent : ${intent} EntityName : ${entity_name} EntityValue : ${entity_value})
#same => n,System(rm /tmp/${UNIQUEID}.wav)
#same => n,System(rm /tmp/${UNIQUEID}-1.wav)
same => n,Gotoif($[${LEN(${intent})}>0]?goto_intent:goto_again)
same => n(goto_intent),Goto(${intent},s,1)
same => n(goto_again),Goto(${CONTEXT},${exten},1)

exten => t,1,Noop(Time out happened...)
same => n,System(rm /tmp/${UNIQUEID}.wav)
same => n,Goto(${CONTEXT},${exten},1)
same => n,Hangup()

[book_appointment]
exten => s,1,Answer()
same => n,MixMonitor(/tmp/${UNIQUEID}.wav,r)
same => n,BackGroundDetect(surely_i_can_help-8khz,1000,500)
same => n,BackGroundDetect(silence/5,1000,500)
same => n,BackGroundDetect(did_not_understand_general-8khz,1000,500)
same => n,BackGroundDetect(silence/5,1000,500)
same => n,BackGroundDetect(did_not_understand_general-8khz,1000,500)
same => n,WaitExten(2)

my speech_to_text.py:
#!/usr/bin/env python3

import sys
import os
import json
import time
import requests
from asterisk.agi import *
from websocket import create_connection
from pydub import AudioSegment
import base64
import constants as ct
import traceback

AUDIO_FD = 3
CONTENT_TYPE = 'audio/l16; rate=8000; channels=1'
ACCEPT = 'audio/pcm'

agi = AGI()

agi.verbose("Entering into Python AGI...")
agi.answer()
file_name = sys.argv[1]+'.wav'

agi.verbose('Recording FileName is %s' % file_name)

def process_chunk(agi, ws, buf):
try:
agi.verbose("Processing chunk")
agi.verbose("Data type: " + str(type(buf))) # Debug line
ws.send_binary(buf)
time.sleep(0.1) # wait for 100 milliseconds
response = ws.recv()
while not response: # wait for a non-empty response
response = ws.recv()
result = json.loads(response)
return result
except Exception as e:
agi.verbose('Error in process_chunk: ' + str(e))
return None

def from_file(file_name):
try:
ws = create_connection("ws://localhost:2700")
ws.send('{ "config" : { "sample_rate" : 8000 } }')
agi.verbose("Connection created")
result = ''
with open(file_name, 'rb') as f:
while True:
data = f.read(8000)
if len(data) == 0:
break
result = process_chunk(agi, ws, data)
ws.send("EOS")
final_result = json.loads(ws.recv())
ws.close()
if 'text' in final_result:
return final_result['text']
else:
return ''
except Exception as e:
agi.verbose('Error in from_file: ' + str(e))
return None

#Classify intent and entity with Rasa query
def get_intent(data):
try:
import requests
import json
url = "http://"+ct.RASA_HOST+"/model/parse"
intent = requests.post(url, data = '{"text":"'+data+'"}')
intent = json.loads(intent.text)
intent_name = intent['intent']['name']
if len(intent['entities'])>0:
data = intent['entities']
entity_name = data[0]['entity']
entity_value = data[0]['value']
else:
entity_name = 'none'
entity_value = 'none'
return intent_name+':'+entity_name+':'+entity_value
except Exception as e:
agi.verbose('Error in get_intent: ' + str(e))
return None

try:
data = from_file(file_name)
if data is not None:
agi.verbose('The Detected Data: %s' %data)
data = get_intent(data)
if data is not None:
data = data.split(':')
intent_name = data[0]
entity_name = data[1]
entity_value = data[2]
agi.set_variable('intent',intent_name)
agi.set_variable('entity_name',entity_name)
agi.set_variable('entity_value',entity_value)
else:
agi.verbose('Could not get intent from Rasa server')
agi.set_variable('intent','default_intent')
else:
agi.verbose('Could not get data from Vosk server')
agi.set_variable('intent','default_intent')
except Exception as e:
agi.verbose('Unexpected error: ' + str(e))
agi.set_variable('intent','default_intent')

my log console asterisk:
speech_to_text.py,/tmp/1708808146.0-1: Entering into Python AGI...
speech_to_text.py,/tmp/1708808146.0-1: Recording FileName is /tmp/1708808146.0-1.wav
speech_to_text.py,/tmp/1708808146.0-1: Connection created
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Processing chunk
speech_to_text.py,/tmp/1708808146.0-1: Data type: <class 'bytes'>
speech_to_text.py,/tmp/1708808146.0-1: Error in from_file: Expecting value: line 1 column 1 (char 0)
speech_to_text.py,/tmp/1708808146.0-1: Could not get data from Vosk server
-- <PJSIP/200-00000000>AGI Script speech_to_text.py completed, returning 0
-- Executing [talk@outgoing:5] NoOp("PJSIP/200-00000000", "The Intent : default_intent EntityName : EntityValue : ") in new stack

ls -l /tmp
total 268
-rw-r--r-- 1 asterisk asterisk 133826 Feb 24 20:55 1708808146.0-1.wav
-rw-r--r-- 1 asterisk asterisk 135724 Feb 24 20:55 1708808146.0.wav