Cannot import name 'available_attrs' from 'django.utils.decorators' (django 3) about django-ajax HOT 5 CLOSED

Traceback (most recent call last):
  File "/Users/branislav/Desktop/learningcurvee/manage.py", line 21, in <module>
    main()
  File "/Users/branislav/Desktop/learningcurvee/manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/core/management/__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/core/management/base.py", line 328, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/core/management/base.py", line 366, in execute
    self.check()
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/core/management/base.py", line 395, in check
    include_deployment_checks=include_deployment_checks,
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/core/management/commands/migrate.py", line 64, in _run_checks
    issues.extend(super()._run_checks(**kwargs))
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/core/management/base.py", line 382, in _run_checks
    return checks.run_checks(**kwargs)
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/core/checks/registry.py", line 72, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/core/checks/urls.py", line 13, in check_url_config
    return check_resolver(resolver)
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/core/checks/urls.py", line 23, in check_resolver
    return check_method()
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/urls/resolvers.py", line 407, in check
    for pattern in self.url_patterns:
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/utils/functional.py", line 48, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/urls/resolvers.py", line 588, in url_patterns
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/utils/functional.py", line 48, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/urls/resolvers.py", line 581, in urlconf_module
    return import_module(self.urlconf_name)
  File "/usr/local/Cellar/python/3.7.6_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/Users/branislav/Desktop/learningcurvee/learningcurvee/urls.py", line 14, in <module>
    path('', include('courses.urls')),
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/urls/conf.py", line 34, in include
    urlconf_module = import_module(urlconf_module)
  File "/usr/local/Cellar/python/3.7.6_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/Users/branislav/Desktop/learningcurvee/courses/urls.py", line 3, in <module>
    from .views import CourseDetailView, CourseUpdateView, CreateSectionView, CreateLessonView, SectionUpdateView, \
  File "/Users/branislav/Desktop/learningcurvee/courses/views.py", line 12, in <module>
    from django_ajax.decorators import ajax
  File "/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django_ajax/decorators.py", line 9, in <module>
    from django.utils.decorators import available_attrs
ImportError: cannot import name 'available_attrs' from 'django.utils.decorators' (/Users/branislav/Desktop/learningcurvee/env/lib/python3.7/site-packages/django/utils/decorators.py)