查找文件的位置register_sidebar （必须位于主题文件夹或插件上）

将ID添加到侧栏

register_sidebar( array(
   \'name\' => __( \'Main Sidebar\', \'theme-slug\' ),

   \'id\' => \'change_me\',  // Add only this line

   \'description\' => __( \'Widgets in this area will be shown on all posts and pages.\', \'theme-slug\' ),
   \'before_widget\' => \'<li id="%1$s" class="widget %2$s">\',
   \'after_widget\'  => \'</li>\',
   \'before_title\'  => \'<h2 class="widgettitle">\',
   \'after_title\'   => \'</h2>\',
 ) );

编辑WP_DEBUG 至false

define(\'WP_DEBUG\', false);

看起来你有一个非常古老的主题。您必须搜索functions.php 的文件register_sidebar 并确保$args 遵循格式mentioned in the codex.