osTicket Version v1.14.2 (cba6035)
Web Server Software Apache/2.4.18 (Ubuntu)
MySQL Version 5.7.31
PHP Version 5.6.37-1+ubuntu16.04

AUTH-LDAP pluging loaded and configured. Logging in as staff (Agent) using LDAP works fine. Search users in AD works fine. Error... whenever an unauthenticated user attempts to open osTicket (index.php) they will get the HTTP 500 error. PHP Log Message:

[06-Aug-2020 18:34:37 UTC] PHP 7. Plugin->getConfig() phar:///var/www/helpdesk/include/plugins/auth-ldap.phar/authentication.php:489
[06-Aug-2020 18:34:38 UTC] PHP Fatal error: Class 'LdapConfig' not found in /var/www/helpdesk/include/class.plugin.php on line 484
[06-Aug-2020 18:34:38 UTC] PHP Stack trace:
[06-Aug-2020 18:34:38 UTC] PHP 1. {main}() /var/www/helpdesk/ssi-hd.php:0
[06-Aug-2020 18:34:38 UTC] PHP 2. require() /var/www/helpdesk/ssi-hd.php:16
[06-Aug-2020 18:34:38 UTC] PHP 3. require_once() /var/www/helpdesk/client.inc.php:21
[06-Aug-2020 18:34:38 UTC] PHP 4. osTicket::start() /var/www/helpdesk/main.inc.php:33
[06-Aug-2020 18:34:38 UTC] PHP 5. PluginManager->bootstrap() /var/www/helpdesk/include/class.osticket.php:643
[06-Aug-2020 18:34:38 UTC] PHP 6. LdapAuthPlugin->bootstrap() /var/www/helpdesk/include/class.plugin.php:147
[06-Aug-2020 18:34:38 UTC] PHP 7. Plugin->getConfig() phar:///var/www/helpdesk/include/plugins/auth-ldap.phar/authentication.php:489

AUTH-LDAP.PHAR was downloadly 08/06/2020. VER. 0.6.3

Thanks in advance for any help that can be rendered.
-Steve

P.S. PHP Info for PHAR below:

Phar: PHP Archive support enabled
Phar EXT version 2.0.2
Phar API version 1.1.1
SVN revision $Id: 780be432570e80dd34c1a9c217ef87ade22bf136 $
Phar-based phar archives enabled
Tar-based phar archives enabled
ZIP-based phar archives enabled
gzip compression enabled
bzip2 compression disabled (install pecl/bz2)
Native OpenSSL support enabled
Phar based on pear/PHP_Archive, original concept by Davey Shafik.
Phar fully realized by Gregory Beaver and Marcus Boerger.
Portions of tar implementation Copyright (c) 2003-2009 Tim Kientzle.
Directive Local Value Master Value
phar.cache_list no value no value
phar.readonly On On
phar.require_hash On On