채점 중 예외가 발생했습니다.
스택 트레이스:
Traceback (most recent call last):
  File "judge/tasks.py", line 141, in judge_submission
    download_data(submission.problem)
  File "judge/tasks.py", line 86, in download_data
    unzip_and_sanitize(destination, data_dir)
  File "judge/tasks.py", line 47, in unzip_and_sanitize
    file = zipfile.ZipFile(archive, "r")
  File "/usr/lib/python2.7/zipfile.py", line 770, in __init__
    self._RealGetContents()
  File "/usr/lib/python2.7/zipfile.py", line 811, in _RealGetContents
    raise BadZipfile, "File is not a zip file"
BadZipfile: File is not a zip file

MEASURETIME 풀어보았는데
채점 실패 오류로 저렇게 뜨네요
어떤 문제인지 잘 모르겠네요