我在WordPress中安装了Revolution Slider插件，但无法激活它，并且出现以下错误：
插件无法激活，因为它触发了致命错误。
Fatal error: Uncaught Error: [] operator not supported for strings in /home/j8fkjve3kft3/public_html/wp-content/plugins/revslider/includes/framework/base-admin.class.php:69
Stack trace:
#0 /home/j8fkjve3kft3/public_html/wp-content/plugins/revslider/admin/revslider-admin.class.php(424): RevSliderBaseAdmin::addMetaBox('Revolution Slid...', '', Array, NULL)
#1 /home/j8fkjve3kft3/public_html/wp-content/plugins/revslider/admin/revslider-admin.class.php(72): RevSliderAdmin->addSliderMetaBox()
#2 /home/j8fkjve3kft3/public_html/wp-content/plugins/revslider/admin/revslider-admin.class.php(44): RevSliderAdmin->init()
#3 /home/j8fkjve3kft3/public_html/wp-content/plugins/revslider/revslider.php(150): RevSliderAdmin->__construct('/home/j8fkjve3k...')
#4 /home/j8fkjve3kft3/public_html/wp-admin/includes/plugin.php(2050): include('/home/j8fkjve3k...')
#5 /home/j8fkjve3kft3/public_html/wp-admin/plugins.php(175): plugin_sandbox_scrape('revslider/revsl...')
#6 {main} thrown in /home/j8fkjve3kft3/public_html/wp-content/plugins/revslider/includes/framework/base-admin.class.php on line 69
我的PHP版本是7.2