fastapi-react : error on streaming (unhandled errors in a TaskGroup there is no current event loop in thread AnyIO worker thread)

When using the code fastapi-react for the tutorial, I couldn't run the streaming message part because of the following error:
unhandled errors in a TaskGroup there is no current event loop in thread AnyIO worker thread

After checking the documentation I've discovered that the event_stream_generator function in backend/src/api/main.py should be

async def event_stream_generator(workflowRunId):
    ''' This helper function is a generator that yields events from the Hatchet event stream. '''
    listener = hatchet.client.listener.stream(workflowRunId)
    async for event in listener:
...