Static file problem

[dengwen168]

hi, i tried to run"python manage.py collectstatic",
i got the error

You're using the staticfiles app without having set the STATIC_ROOT setting to a filesystem path.
so i set STATIC_ROOT=os.path.join(BASE_DIR, 'static')

i got the following error:

The STATICFILES_DIRS setting should not contain the STATIC_ROOT setting

could you please tell me how to selve this problem?
thanks.