Fatal error: Uncaught exception 'Error' with message 'Handler class is not set for "theme" config option' in C:\Xampp\htdocs\projetos\application\models\config_options\ConfigOption.class.php:48 Stack trace: #0 C:\Xampp\htdocs\projetos\application\models\config_options\ConfigOption.class.php(67): ConfigOption->getConfigHandler() #1 C:\Xampp\htdocs\projetos\application\models\config_options\ConfigOptions.class.php(54): ConfigOption->getValue() #2 C:\Xampp\htdocs\projetos\application\functions.php(283): ConfigOptions::getOptionValue('theme', NULL) #3 C:\Xampp\htdocs\projetos\application\helpers\page.php(793): config_option() #4 C:\Xampp\htdocs\projetos\application\helpers\page.php(169): get_stylesheet_url('theme') #5 C:\Xampp\htdocs\projetos\application\layouts\dialog.php(5): stylesheet_tag() #6 C:\Xampp\htdocs\projetos\environment\classes\template\Template.class.php(74): include('C:\Xampp\htdocs...') #7 C:\Xampp\htdocs\projetos\environment\classes\template\Template.class.php(62): Template->includeTemplate('dialog.css') #8 C in C:\Xampp\htdocs\projetos\application\models\config_options\ConfigOption.class.php on line 48

help me plz...
ty