python manage.py collectstatic run error！ #2
Description
按照步骤配置以后，运行python manage.py collectstatic，得到以下错误：
Traceback (most recent call last):
File "manage.py", line 9, in
execute_from_command_line(sys.argv)
File "/home/gavin/.virtualenvs/djangodev/lib/python3.5/site-packages/django/core/management/init.py", line 367, in execute_from_command_line
utility.execute()
File "/home/gavin/.virtualenvs/djangodev/lib/python3.5/site-packages/django/core/management/init.py", line 341, in execute
django.setup()
File "/home/gavin/.virtualenvs/djangodev/lib/python3.5/site-packages/django/init.py", line 27, in setup
apps.populate(settings.INSTALLED_APPS)
File "/home/gavin/.virtualenvs/djangodev/lib/python3.5/site-packages/django/apps/registry.py", line 115, in populate
app_config.ready()
File "/home/gavin/.virtualenvs/djangodev/lib/python3.5/site-packages/django/contrib/admin/apps.py", line 23, in ready
self.module.autodiscover()
File "/home/gavin/.virtualenvs/djangodev/lib/python3.5/site-packages/django/contrib/admin/init.py", line 26, in autodiscover
autodiscover_modules('admin', register_to=site)
File "/home/gavin/.virtualenvs/djangodev/lib/python3.5/site-packages/django/utils/module_loading.py", line 50, in autodiscover_modules
import_module('%s.%s' % (app_config.name, module_to_search))
File "/usr/lib/python3.5/importlib/init.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 986, in _gcd_import
File "", line 969, in _find_and_load
File "", line 958, in _find_and_load_unlocked
File "", line 673, in _load_unlocked
File "", line 665, in exec_module
File "", line 222, in _call_with_frames_removed
File "/home/gavin/django/codingtang/judge/admin.py", line 4, in
from .forms import ClsForm, ExamUsersForm, ProblemForm
File "/home/gavin/django/codingtang/judge/forms.py", line 4, in
from pagedown.widgets import AdminPagedownWidget
File "/home/gavin/.virtualenvs/djangodev/lib/python3.5/site-packages/pagedown/widgets.py", line 69, in
class AdminPagedownWidget(PagedownWidget, admin_widgets.AdminTextareaWidget):
File "/home/gavin/.virtualenvs/djangodev/lib/python3.5/site-packages/pagedown/widgets.py", line 70, in AdminPagedownWidget
class Media:
File "/home/gavin/.virtualenvs/djangodev/lib/python3.5/site-packages/pagedown/widgets.py", line 72, in Media
"all": (compatible_staticpath("admin/css/pagedown.css"),)
File "/home/gavin/.virtualenvs/djangodev/lib/python3.5/site-packages/pagedown/utils.py", line 13, in compatible_staticpath
return static(path)
File "/home/gavin/.virtualenvs/djangodev/lib/python3.5/site-packages/django/templatetags/static.py", line 163, in static
return StaticNode.handle_simple(path)
File "/home/gavin/.virtualenvs/djangodev/lib/python3.5/site-packages/django/templatetags/static.py", line 114, in handle_simple
return staticfiles_storage.url(path)
TypeError: url() missing 1 required positional argument: 'expire'