Fellow Folks, When utilizing htaccess to password safeguard 1 file inside the same directory

Given: folderX with within it file.php and password file .htpasswd and .htaccess file with below code:

<Files file.php>
AuthUserFile /var/www/vhosts/website.com/httpdocs/folderX/.htpasswd
Require valid-user
AuthName "Login"
AuthType Basic

When code is said out then your file.php is alright HTTP status 200 OK. Once the code is avtive, the file redirects towards the home page saying:

HTTP/1.1 301 Moved Permanently
Server: Apache/2..54 (Fedora)
WWW-Authenticate: Fundamental realm="Login"

What is wrong? Thanks greatly for just about any suggestions about this piculiar error