import gradio as gr
from context.db_loader import SQLiteContextLoader
from models.mini_4o_model import ModelClient
import constants
from helpers import load_json_file


class NeuroRavenApp:
    def __init__(self):
        self.demo = None
        self.system_prompt = None
        self.current_theme = None
        self.client = ModelClient()
        self.context_loader = SQLiteContextLoader()
        self.conversation_themes = self.get_conversation_themes()
        if constants.NO_CONTEXT not in self.conversation_themes:
            self.conversation_themes.append(constants.NO_CONTEXT)

    @staticmethod
    def get_conversation_themes():
        themes = load_json_file(constants.CONVERSATION_THEMES_JSON)
        return themes

    def handle_query(self, message, history, context_theme, should_save):
        # Сохранение сообщения в базу данных, если чекбокс активирован
        if should_save and isinstance(self.context_loader, SQLiteContextLoader):
            if context_theme == constants.NO_CONTEXT:
                return constants.ERROR_CANNOT_SAVE_MESSAGE
            self.context_loader.save_message(context_theme, message)
            self.current_theme = None
            self.demo.Checkbox.value = False
            return constants.MESSAGE_SAVED_TO_CONTEXT

        if context_theme != self.current_theme:
            context = self.context_loader.load_context(context_theme)
            if context:
                self.system_prompt = constants.ANSWER_USING_CONTEXT_PROMPT.format(context=context)
            else:
                self.system_prompt = constants.DEFAULT_SYSTEM_PROMPT
            self.current_theme = context_theme

        response = self.client.get_response(
            message=message,
            history=history,
            sys_prompt=self.system_prompt
        )
        return response

    def launch_app(self):
        self.demo = gr.ChatInterface(
            fn=self.handle_query,
            chatbot=gr.Chatbot(height=500),
            textbox=gr.Textbox(
                placeholder=constants.INPUT_PLACEHOLDER,
                container=False,
                scale=7
            ),
            title="NeuroRaven",
            theme="soft",
            retry_btn=None,
            clear_btn=constants.CLEAR_BUTTON_LABEL,
            additional_inputs=[
                gr.Dropdown(
                    self.conversation_themes,
                    label=constants.SELECT_CONTEXT_THEME_LABEL,
                    value=constants.NO_CONTEXT
                ),
                gr.Checkbox(
                    label=constants.SAVE_MESSAGE_LABEL,
                    value=False
                )
            ],
            css="footer{display:none !important}"
        ).launch(server_name=constants.SERVER_NAME, server_port=constants.SERVER_PORT)


if __name__ == "__main__":
    app = NeuroRavenApp()
    app.launch_app()

Почему возникает ошибка:
Traceback (most recent call last):
  File "C:\ProgramData\anaconda3\envs\NeuroRaven_env\lib\site-packages\gradio\queueing.py", line 536, in process_events
    response = await route_utils.call_process_api(
  File "C:\ProgramData\anaconda3\envs\NeuroRaven_env\lib\site-packages\gradio\route_utils.py", line 322, in call_process_api
    output = await app.get_blocks().process_api(
  File "C:\ProgramData\anaconda3\envs\NeuroRaven_env\lib\site-packages\gradio\blocks.py", line 1935, in process_api
    result = await self.call_function(
  File "C:\ProgramData\anaconda3\envs\NeuroRaven_env\lib\site-packages\gradio\blocks.py", line 1518, in call_function
    prediction = await fn(*processed_input)
  File "C:\ProgramData\anaconda3\envs\NeuroRaven_env\lib\site-packages\gradio\utils.py", line 793, in async_wrapper
    response = await f(*args, **kwargs)
  File "C:\ProgramData\anaconda3\envs\NeuroRaven_env\lib\site-packages\gradio\chat_interface.py", line 623, in _submit_fn
    response = await anyio.to_thread.run_sync(
  File "C:\ProgramData\anaconda3\envs\NeuroRaven_env\lib\site-packages\anyio\to_thread.py", line 56, in run_sync
    return await get_async_backend().run_sync_in_worker_thread(
  File "C:\ProgramData\anaconda3\envs\NeuroRaven_env\lib\site-packages\anyio\_backends\_asyncio.py", line 2441, in run_sync_in_worker_thread
    return await future
  File "C:\ProgramData\anaconda3\envs\NeuroRaven_env\lib\site-packages\anyio\_backends\_asyncio.py", line 943, in run
    result = context.run(func, *args)
  File "C:\Developing\Python\NeuroRaven\app.py", line 31, in handle_query
    self.demo.Checkbox.value = False
AttributeError: 'NoneType' object has no attribute 'Checkbox'