DAV+SVN - I expect username popup but I got 'Forbidden'

[Sean Kim]

-- Expected behavior
open web browser
type: http://123.123.123.123/svn
username/password popup showed
repository is not allowed to anonymous user

-- But I have now
I got just 'Forbidden' page

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// in '/etc/apache2/sites-available/default' file
### svn
    <Location /svn>
        DAV svn
        SVNPath /home/svn
        AuthType Basic
        AuthName "svn"
        AuthUserFile /etc/subversion/passwd
        AuthzSVNAccessFile /etc/subversion/authz
        <LimitExcept GET PROPFIND OPTIONS REPORT>
            Require valid-user
        </LimitExcept>
    </Location>
### end svn
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// in '/etc/subversion/authz' file
[/]
sean = rw
* =
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Thank you

Sean