Celery Task Tracing ValueError: Unpacking Issue in a Flask Web App Migration, python backend

Question

Here is my attempt to clarify my question.

I'm working on a Flask application that uses Celery for asynchronous task management.

Here's the high-level flow of my application:

Flask Route: I've defined a Flask route /orchestrate that receives user input via a POST request. This route extracts user_input from the request and enqueues a Celery task orchestrate_music_task with this input.

@app.route('/orchestrate', methods=['POST'])
def orchestrate_music():
    # Flask route logic...
    task = orchestrate_music_task.delay(user_input)

Celery Task: The orchestrate_music_task is a Celery task that initializes an instance of the Orchestrator class and calls its orchestrate method with the user_input. The orchestration logic generates MIDI files and returns their paths.

@celery.task
def orchestrate_music_task(user_input):
    # Celery task logic...
    midi_file_paths = orchestrator.orchestrate(user_input)

Orchestrator Class: Within the Orchestrator class, the orchestrate method interprets the user input to generate music directives, uses these directives to generate melody, harmony, and rhythm JSON structures, transforms these structures, and finally generates MIDI files. This method attempts to manage the temporary directory for MIDI files within its scope.

    def orchestrate(self, user_input):
        # Orchestrator logic
        return midi_file_paths

The challenge I'm facing is with the ValueError related to unpacking in the Celery task's execution. This error seems to be happening internally, possibly when Celery tries to handle the result of the orchestrate_music_task. Here is a synopsis of what is working:

Celery Queueing: The Celery setup for queueing tasks is functioning as expected. Tasks are successfully enqueued and dequeued without any issues, indicating that the basic Celery configuration and Redis broker setup are correctly implemented.

Task Initiation: The initiation of Celery tasks, including the orchestrate_music_task, from the Flask route is working smoothly. The tasks are picked up by the Celery workers, which confirms that the communication between Flask and Celery is properly configured.

Partial Orchestration Logic: Parts of the orchestration logic within the Orchestrator class, specifically up to the generation of JSON structures for melody, harmony, and rhythm, are executing without errors. This suggests that the foundational music generation logic and integration with external libraries (if any) are correctly set up.

I'm looking for insights into what might be causing this ValueError and how to resolve it. Any guidance on improving the structure or execution of this orchestration process would also be greatly appreciated.