Activating Plugin Error:Uncaught Error: [] operator not supported for strings

Hi , I’m new to wordpress and using it to develop a wooCommerce site , now I uploaded a theme and trying to install and activate the plugins recommended but it’s not working . It’s giving the Error :

Fatal error: Uncaught Error: [] operator not supported for strings in C:\xampp\htdocs\furnitureworld\wp-content\plugins\revslider\includes\framework\base-admin.class.php:71 Stack trace: #0 C:\xampp\htdocs\furnitureworld\wp-content\plugins\revslider\admin\revslider-admin.class.php(572): RevSliderBaseAdmin::addMetaBox(‘Revolution Slid…’, ”, Array, NULL) #1 C:\xampp\htdocs\furnitureworld\wp-content\plugins\revslider\admin\revslider-admin.class.php(73): RevSliderAdmin->addSliderMetaBox() #2 C:\xampp\htdocs\furnitureworld\wp-content\plugins\revslider\admin\revslider-admin.class.php(44): RevSliderAdmin->init() #3 C:\xampp\htdocs\furnitureworld\wp-content\plugins\revslider\revslider.php(162): RevSliderAdmin->__construct(‘C:\\xampp\\htdocs…’) #4 C:\xampp\htdocs\furnitureworld\wp-admin\includes\plugin.php(568): include_once(‘C:\\xampp\\htdocs…’) #5 C:\xampp\htdocs\furnitureworld\wp-content\themes\interiart\plugins\class-tgm-plugin-activation.php(945): activate_plugin(‘revslider/revsl…’) #6 C:\xampp\htdocs\furnitureworld\w in C:\xampp\htdocs\furnitureworld\wp-content\plugins\revslider\includes\framework\base-admin.class.php on line 71

Now I don’t know how to manage it , Kindly guide me .