Unable to export labeled dataset (500 Error)

[garyhsu29]

How to reproduce the behaviour:

Upload 3000 records for named entity recognition, and export the data, it gave me a 500 Error.

Your Environment

• Operating System: CentOS Linux 7 (Core)
• Python Version Used: 3.6.8
• When you install doccano: July 16, 2021
• How did you install doccano (Heroku button etc): Shell

Error message:
Environment:

Request Method: GET

• Request URL: http://69.25.136.155:8000/v1/projects/2/download?taskId=3801b266-7b00-42c4-afe6-36dba47ea0a9

Django Version: 3.2.5
Python Version: 3.6.8
Installed Applications:

['whitenoise.runserver_nostatic',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'api.apps.ApiConfig',
 'rest_framework',
 'rest_framework.authtoken',
 'django_filters',
 'social_django',
 'polymorphic',
 'corsheaders',
 'drf_yasg',
 'dj_rest_auth',
 'django_celery_results',
 'django_drf_filepond']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'whitenoise.middleware.WhiteNoiseMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'social_django.middleware.SocialAuthExceptionMiddleware',
 'corsheaders.middleware.CorsMiddleware']

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/django/views/generic/base.py", line 70, in view
    return self.dispatch(request, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/rest_framework/views.py", line 509, in dispatch
    response = self.handle_exception(exc)
  File "/usr/local/lib/python3.6/site-packages/rest_framework/views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/usr/local/lib/python3.6/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
    raise exc
  File "/usr/local/lib/python3.6/site-packages/rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/backend/api/views/export_dataset.py", line 34, in get
    return FileResponse(open(filename, mode='rb'), as_attachment=True)

Exception Type: TypeError at /v1/projects/2/download
Exception Value: expected str, bytes or os.PathLike object, not OperationalError
https://www.loom.com/share/1e646155380a4eb08a1b0590e5a62f55