The directory /sites/default/files/private does not exist

salam..

saya telah cuba install drupal 8 di localhost dan ada sedikit error:

1) FILE SYSTEM Writable (public download method)

The directory /sites/default/files/private does not exist. You may need to set the correct directory at the file system settings page or change the current directory's permissions so that it is writable.

2) PRIVATE FILES DIRECTORY

Not fully protected