숙제 제출이 안되요

C:Usershyundaeyulepython_mooclab_2lab_2windows>submit.bat fbra81728

∙ Session token prefix: e077f58efe

✔ [0] Session e077f58efe is ready.

Uploading files: 100%|█| 12.4k/12.4k [00:00<00:00, 448kbytes/s, file=basic_opeartions_unit_test.py]

✔ [0] Uploading done.

✘ [0] BackendClientError('Request to the API endpoint has failed.nCheck your network connection and/or the server status.nError detail: WSServerHandshakeError("404, message=\'Invalid response status\'")')

요렇게 뜨네요