Within last 10days, with python 3 and by using the google_auth_oauthlib and googleapiclient packages, I have been able to create Google Sheet (using python code) and do basic write/read values to any cell. I accomplished this by going through random videos on Youtube.

Suddenly today evening, the code stopped working with the following error:

google.auth.exceptions.RefreshError: ('invalid_grant: Token has been expired or revoked.', {'error': 'invalid_grant', 'error_description': 'Token has been expired or revoked.'})

I am new to Google API and have no clue why this is happening. Is there something I need to 'reset' in my account in console.cloud.google.com to avoid this?

Following is the code which used to work fine before, but doesnt now:

import os
from Google import Create_Service

spreadsheet_id= '1F8mAvHWqHL_3JHuKnv9Fy9vm2_Zm2tR13DNKj9oNxzU'

FOLDER_PATH = r'C:\Users\Owner'
CLIENT_SECRET_FILE = os.path.join(FOLDER_PATH, 'Client_Secret2.json')
API_SERVICE_NAME = 'sheets'
API_VERSION = 'v4'
SCOPES = ['https://www.googleapis.com/auth/spreadsheets']

service = Create_Service(CLIENT_SECRET_FILE, API_SERVICE_NAME, API_VERSION, SCOPES)
service.spreadsheets().values().clear(
    spreadsheetId=spreadsheet_id,
    range='A1:AA1000',
    body={}
).execute()

Here is code for Google.pywhich has Create_Service :

import pickle
import os
from google_auth_oauthlib.flow import Flow, InstalledAppFlow
from googleapiclient.discovery import build
from googleapiclient.http import MediaFileUpload, MediaIoBaseDownload
from google.auth.transport.requests import Request


def Create_Service(client_secret_file, api_name, api_version, *scopes):
    print(client_secret_file, api_name, api_version, scopes, sep='-')
    CLIENT_SECRET_FILE = client_secret_file
    API_SERVICE_NAME = api_name
    API_VERSION = api_version
    SCOPES = [scope for scope in scopes[0]]
    print(SCOPES)

    cred = None

    pickle_file = f'token_{API_SERVICE_NAME}_{API_VERSION}.pickle'
    # print(pickle_file)

    if os.path.exists(pickle_file):
        with open(pickle_file, 'rb') as token:
            cred = pickle.load(token)

    if not cred or not cred.valid:
        if cred and cred.expired and cred.refresh_token:
            cred.refresh(Request())
        else:
            flow = InstalledAppFlow.from_client_secrets_file(CLIENT_SECRET_FILE, SCOPES)
            cred = flow.run_local_server()

        with open(pickle_file, 'wb') as token:
            pickle.dump(cred, token)

    try:
        service = build(API_SERVICE_NAME, API_VERSION, credentials=cred)
        print(API_SERVICE_NAME, 'service created successfully')
        return service
    except Exception as e:
        print('Unable to connect.')
        print(e)
        return None

def convert_to_RFC_datetime(year=1900, month=1, day=1, hour=0, minute=0):
    dt = datetime.datetime(year, month, day, hour, minute, 0).isoformat() + 'Z'
    return dt

Here is the photo from my console.cloud.google.com :