Nessus Python script ChunkedEncodingError 104 Connection reset by peer

Question

I want to use a Python Script to access Nessus API and start a scanning . I have installed my Nessus service on my Ubuntu Virtual Machine https://127.0.0.1:8834 , here is my code (I hide my accesskey and secretkey):

import json
import warnings
from urllib3.exceptions import InsecureRequestWarning

# Specify the Nessus API endpoint and credentials
nessus_url = "https://127.0.0.1:8834"
access_key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
secret_key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

# Specify the target for the scan
target = "140.113.199.245"

# Define the scan policy
policy_id = 1

# Specify the scan name
scan_name = "Scan"

# Specify the scan template
template = "web-app"

# Define the headers for the API request
headers = {
    "X-ApiKeys": f"accessKey={access_key};secretKey={secret_key}",
    "Content-type": "application/json"
}


# Create the request body for the scan
request_body = {
    "settings": {
        "name": scan_name,
        "description": "",
        "policy_id": policy_id,
        "text_targets": target,
        "template": template
    }
}

#requests.packages.urllib3.disable_warnings(category=InsecureRequestWarning)
# /opt/nessus/com/nessus/CA/cacert.pem
# Send the API request to start the scan
with warnings.catch_warnings():
    warnings.simplefilter("ignore")
    response = requests.post(f"{nessus_url}/scans", headers=headers, data=json.dumps(request_body), verify = "/opt/nessus/com/nessus/CA/cacert.pem",stream = True,timeout=30)
# Print the response
print(response.text)

and after I run this Script, error occur as below:

requests.exceptions.ChunkedEncodingError:
 ("Connection broken: ConnectionResetError(104, 'Connection reset by peer')"
 ConnectionResetError(104, 'Connection reset by peer'))

What is this error and how can I fix this ?