Access Token Can't be refreshed without refresh token and app key in Python

[Sufiyanashraf]

I am building an app in python to automatically update a file using dropbox API, but it shows an error after 4 hours however I can't find any mistake can you point out my mistake? My code Link: https://github.com/sufiyanashraf/dropboxhelp/blob/main/cantrefresh

[Sufiyanashraf]

For now this code is perfectly working but I still want to open this topic 4 hours more to confirm if program doesn't die after that!

import sys
import dropbox
from dropbox import DropboxOAuth2FlowNoRedirect
from dropbox.files import WriteMode
import time

while True:
    with dropbox.Dropbox(oauth2_access_token='<access token>',
                     oauth2_refresh_token='<refresh token>',
                     app_key='<app key>',
                     app_secret='<app secret>') as dbx:
        try:
            with open('rtk.txt', 'rb') as f:
                file_contents = f.read()   
            dbx.files_upload(file_contents, '/rtk.txt', mode=dropbox.files.WriteMode('overwrite'))
        except Exception as e:
            print(f"An error occurred: {e}")
    time.sleep(60)