Warning: require(/www/wwwroot/abc_com/wp-admin/wp-blog-header.php): Failed to open stream: No such file or directory in /www/wwwroot/abc_com/wp-admin/index.php on line 19
Fatal error: Uncaught Error: Failed opening required '/www/wwwroot/abc_com/wp-admin/wp-blog-header.php' (include_path='.:') in /www/wwwroot/abc_com/wp-admin/index.php:19 Stack trace: #0 {main} thrown in /www/wwwroot/abc_com/wp-admin/index.php on line 19
解决方法1：
聽起來像是 wp-blog-header.php 這個檔案不見了。你可以透過 WordPress 重新載入你的佈景主題，或者建立一個空白檔案，命名為 wp-blog-header.php，然後登入你的 cPanel/宝塔，把這個空白檔案上傳到 wp-admin 資料夾。我試過這樣做，而且不只一次成功。程式碼不一定真的要用到這個檔案，它只是需要知道它存在而已。
解决方法2：
According to wordpress rule, avoid over writing the wp-admin and wp-include folder files. Because the changers in this folder (like: wp-admin, wp-includes) exist till the wordpress in not updated. So, It means your application is not secure and any virus or hacking is effecting your application.
Solution:
Temporary: Download any wordpress version in your local system or open any existing wordpress in you system and go to wp-admin/index.php file and copy the whole code and paste the code in your application at the same location( wp-admin/index.php).
Permanent: Clean your code and file's in you hosting.
Note: if you have multiple application running in your hosting then clean all the application
翻译如下：
根据 WordPress 规则，请避免覆盖 wp-admin 和 wp-include 文件夹文件。因为这些文件夹中的修改器（例如：wp-admin、wp-includes）会一直存在，直到 WordPress 更新为止。这意味着您的应用程序不安全，并且可能受到病毒或黑客攻击。
解决方案：
临时解决方案：在本地系统中下载任意版本的 WordPress，或打开系统中现有的 WordPress，然后转到 wp-admin/index.php 文件，复制完整代码并将其粘贴到应用程序中的同一位置 (wp-admin/index.php)。
永久解决方案：清理主机中的代码和文件。
注意：如果您的主机中运行了多个应用程序，请清理所有应用程序。
解决方法3：
So the solution is.
- Change the file wp-load.php permission 644 to 444.
- Then download the specific version of WordPress from here. Release Archive – WordPress.org (for check your current WordPress version goto wp-includes/version.php) you can see your WordPress version.
- Open the zip folder then copy the wp-load.php code and paste to empty file in your server
