Warning: Undefined property: Configuration::$ClassName in /usr/share/smsserver/html/index.php on line 78

Warning: require_once(admin/.class): Failed to open stream: No such file or directory in /usr/share/smsserver/html/index.php on line 78

Fatal error: Uncaught Error: Failed opening required 'admin/.class' (include_path='.:/usr/share/php:/usr/share/smsserver/html/admin') in /usr/share/smsserver/html/index.php:78
Stack trace:
#0 {main}
  thrown in /usr/share/smsserver/html/index.php on line 78