Telegram client on pythonanywhere using telethon

Question

SORRY FOR MY ENGLISH!))

Trying to launch telegram client on pythonanywhere hosting using flask

Loaded all necessary libraries (see photo1)

On this site created an api-application, got it app_id and api_hash

Further, I made a flask application with this code (for test)

@app.route('/')
def hello_world():
    #------------------------If an error occurred during import------------
    try:
        from telethon import TelegramClient, sync
    except Exception as e:
        return 'IMPORT ERROR: ' + str(e)
    #------------------------we catch it-----------------------------------

    api_id = API_ID_FROM_MY_TELEGRAM_ORG #Тут подставляю свое
    api_hash = API_HASH_CODE_FROM_MY_TELEGRAM_ORG #Тут подставляю свое

    #----------If an error occurred while creating the object--------------
    try:
        client = TelegramClient('test_session', api_id, api_hash)
        return 'Succes!'
    except Exception as e:
        return 'OBJECT ERROR: ' + str(e)
    #------------------------we catch it-----------------------------------

When you start and open the application in the browser, the following error is displayed (in text form):

OBJECT ERROR: database is locked

This text corresponds to the last try/catch construction, so an error occurs when trying to create an object client = TelegramClient('test_session', api_id, api_hash)

What is this exception and how in my case to fight it?