Help! Box API Issue!

We are running an automation application that uses box api to download / upload files from specific box folders. It works well before today morning, but stopped working since today afternoon. Anything wrong?
Below pieces of log information for your reference.

[2024-05-15 15:54:15,475]-INFO-[bla-start.py::__main__::<module>::line#:773] - BLA system started successfully!
[2024-05-15 15:54:16,494]-INFO-[bla-start.py::__main__::bla_monitor::line#:89] - Loop[1]: start to monitor Temp folder for request files...
"GET https://api.box.com/2.0/folders/261390481639/items?offset=0" 404 324
{'Date': 'Wed, 15 May 2024 07:54:18 GMT', 'Content-Type': 'application/json', 'Transfer-Encoding': 'chunked', 'x-envoy-upstream-service-time': '239', 'box-request-id': '043f4f2a94110fe33bcdb03379c5a4c92', 'cache-control': 'no-cache, no-store', 'strict-transport-security': 'max-age=31536000', 'Via': '1.1 google', 'Alt-Svc': 'h3=":443"; ma=2592000,h3-29=":443"; ma=2592000'}
{'code': '---ound',
 'context_info': {'errors': [{'message': "Invalid value 'd_261390481639'. "
                                         "'folder' with value 'd_261390481639' "
                                         'not found',
                              'name': 'folder',
                              'reason': 'invalid_parameter'}]},
 'help_url': 'http://developers.box.com/docs/#errors',
 'message': 'Not Found',
 'request_id': 'jt2e3jhpq95fpavi',
 'status': 404,
 'type': 'error'}

[2024-05-15 15:54:17,879]-INFO-[tokens.py::TokenManager::refresh_token::line#:32] - Try to refresh token as it's expired…
[2024-05-15 15:54:19,432]-INFO-[tokens.py::TokenManager::refresh_token::line#:67] - Token was refreshed successfully!
[2024-05-15 15:54:19,468]-INFO-[bla-start.py::__main__::bla_monitor::line#:131] - Loop[1]: found [0] request file(s).
[2024-05-15 15:54:19,468]-INFO-[bla-start.py::__main__::bla_monitor::line#:425] - Loop[1]: checking approve status for incomplete bl applications...
"GET https://api.box.com/2.0/folders/261392446856/items?offset=0" 404 324
{'Date': 'Wed, 15 May 2024 07:54:21 GMT', 'Content-Type': 'application/json', 'Transfer-Encoding': 'chunked', 'x-envoy-upstream-service-time': '242', 'box-request-id': '052d40f5bd917f0b7d1d006856c388b6b', 'cache-control': 'no-cache, no-store', 'strict-transport-security': 'max-age=31536000', 'Via': '1.1 google', 'Alt-Svc': 'h3=":443"; ma=2592000,h3-29=":443"; ma=2592000'}
{'code': '---ound',
 'context_info': {'errors': [{'message': "Invalid value 'd_261392446856'. "
                                         "'folder' with value 'd_261392446856' "
                                         'not found',
                              'name': 'folder',
                              'reason': 'invalid_parameter'}]},
 'help_url': 'http://developers.box.com/docs/#errors',
 'message': 'Not Found',
 'request_id': 'icbez7hpq95hhfyf',
 'status': 404,
 'type': 'error'}