License activation error?

Hi all, just encout this error on activing my license, any idea? Thanks.

Warning: Illegal string offset ‘sidebar-3’ in /srv/users/serverpilot/apps/pagesbleus-pro/public/wp-content/themes/DT/framework/class/class_functions.php on line 363

Warning: Illegal string offset ‘sidebar-3’ in /srv/users/serverpilot/apps/pagesbleus-pro/public/wp-content/themes/DT/framework/class/class_functions.php on line 371

Fatal error: Uncaught Error: Cannot use string offset as an array in /srv/users/serverpilot/apps/pagesbleus-pro/public/wp-content/themes/DT/framework/class/class_functions.php:371 Stack trace: #0 /srv/users/serverpilot/apps/pagesbleus-pro/public/wp-content/themes/DT/framework/class/class_admin.php(839): core_admin_2_themeinstall() #1 /srv/users/serverpilot/apps/pagesbleus-pro/public/wp-includes/class-wp-hook.php(298): wlt_admin->_admin_init(”) #2 /srv/users/serverpilot/apps/pagesbleus-pro/public/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters(NULL, Array) #3 /srv/users/serverpilot/apps/pagesbleus-pro/public/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #4 /srv/users/serverpilot/apps/pagesbleus-pro/public/wp-admin/admin.php(154): do_action(‘admin_init’) #5 {main} thrown in /srv/users/serverpilot/apps/pagesbleus-pro/public/wp-content/themes/DT/framework/class/class_functions.php on line 371