Woocommerce Change Password Protected product Error Notice

wcppen.php

function custom_password_protected_error_message( $translated_text, $text, $domain ) {
    if ( $text === 'This product is protected and cannot be purchased.' ) {
        $translated_text = 'Your custom error message here.';
    }
    return $translated_text;
}
add_filter( 'gettext', 'custom_password_protected_error_message', 20, 3 );