Under Ubuntu, running Django project failed with error:

(env36) root@JD:~/xueyiwang# python manage.py runserver 0.0.0.0:8000 
Performing system checks...

Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7f47dd74a950>
Traceback (most recent call last):
  File "/root/env36/lib/python3.6/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/root/env36/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 120, in inner_run
    self.check(display_num_errors=True)
  File "/root/env36/lib/python3.6/site-packages/django/core/management/base.py", line 410, in check
    raise SystemCheckError(msg)
django.core.management.base.SystemCheckError: SystemCheckError: System check identified some issues:

ERRORS:
?: (staticfiles.E002) The STATICFILES_DIRS setting should not contain the STATIC_ROOT setting.

The error may be caused by a problem in setting the static file directory in settings

STATIC_ROOT=os.path.join(BASE_DIR,"static/")#wrong
STATIC_ROOT=os.path.join(BASE_DIR,"/static/")#correct