Fatal error code nach Admin-Anmeldung

Fatal error: Uncaught Error: [] operator not supported for strings in /homepages/9/d645282326/htdocs/clickandbuilds/ContentManufaktur/wp-content/plugins/revslider/includes/framework/base-admin.class.php:71 Stack trace: #0 /homepages/9/d645282326/htdocs/clickandbuilds/ContentManufaktur/wp-content/plugins/revslider/admin/revslider-admin.class.php(572): RevSliderBaseAdmin::addMetaBox('Revolution Slid...', '', Array, NULL) #1 /homepages/9/d645282326/htdocs/clickandbuilds/ContentManufaktur/wp-content/plugins/revslider/admin/revslider-admin.class.php(73): RevSliderAdmin->addSliderMetaBox() #2 /homepages/9/d645282326/htdocs/clickandbuilds/ContentManufaktur/wp-content/plugins/revslider/admin/revslider-admin.class.php(44): RevSliderAdmin->init() #3 /homepages/9/d645282326/htdocs/clickandbuilds/ContentManufaktur/wp-content/plugins/revslider/revslider.php(162): RevSliderAdmin->__construct('/homepages/9/d6...') #4 /homepages/9/d645282326/htdocs/clickandbuilds/ContentManufaktur/wp-settings.php(304): include_once('/homepages/9/d6...') in /homepages/9/d645282326/htdocs/clickandbuilds/ContentManufaktur/wp-content/plugins/revslider/includes/framework/base-admin.class.php on line 71