LightSail Wordpress Error 500

Question

I have been hosting a wordpress site since June 2024 using Lightsail Bitnami Wordpress. Everything was working fine, till I navigated to wp admin console today. I guess the site stopped working on Mar 8 2025 (based on the error log timestamp), but I learned of it today upon visiting the URL/admin

What is baffling is that I have not touched the settings nor I have made any changes to the wordpress site. I also searched the re:Post chats to find something relevant but have not so far. I am posting the last error from the log, this error has been part of the log file repeatedly - this is pretty much the only error I see.

```
[Sat Mar 08 23:59:07.719678 2025] [proxy_fcgi:error] [pid 2234373:tid 140149136549568] [client 57.141.0.18:36804] AH01071: Got e
rror 'PHP message: PHP Warning:  require(/opt/bitnami/wordpress/wp-includes/html-api/class-wp-html-processor.php): Failed to ope
n stream: No such file or directory in /opt/bitnami/wordpress/wp-settings.php on line 264; PHP message: PHP Fatal error:  Uncaug
ht Error: Failed opening required '/opt/bitnami/wordpress/wp-includes/html-api/class-wp-html-processor.php' (include_path='.:/op
t/bitnami/php/lib/php') in /opt/bitnami/wordpress/wp-settings.php:264
Stack trace:
#0 /bitnami/wordpress/wp-config.php(111): r
equire_once()
#1 /opt/bitnami/wordpress/wp-load.php(50): require_once('...')
#2 /opt/bitnami/wordpress/wp-blog-header.php(13):
 require_once('...')
#3 /opt/bitnami/wordpress/index.php(19): require('...')
#4 {main}
  thrown in /opt/bitnami/wordpress/wp-
settings.php on line 264'
```
I rebooted the instance this morning to see whether the site will come back up and it did not. It has been over 2 hours and the site is still not responding.

Has anyone seen such random occurrence of the site no longer responding?

yujie · Answer

Hi,

Thank you for reaching out, this may happen due to you due to failed Wordpress auto update, if the `/opt/bitnami/wordpress/wp-includes/html-api/class-wp-html-processor.php` does not exist on your directory, try to get a fresh copy of the `html-api` directory from Wordpress official website and replace the directory on your host, It is recommended to take a snapshot of your instance before making any changes, thank you.

thank you
Yujie

re:Post Agent · Answer

The error you're experiencing with your WordPress site on Lightsail appears to be related to a missing or inaccessible file in your WordPress installation. Specifically, the error message indicates that the system is unable to find or open the file 'class-wp-html-processor.php' in the WordPress includes directory.

This issue could have occurred for several reasons:

1. Incomplete or corrupted WordPress update: It's possible that a WordPress core update was initiated but not completed successfully, leading to missing files.

2. File system issues: There might be problems with file permissions or disk space that are preventing WordPress from accessing necessary files.

3. Plugin or theme conflicts: Although you mentioned not making any changes, it's possible that an automatic update to a plugin or theme could have caused conflicts with core WordPress files.

To address this issue, you can try the following steps:

1. Verify file system integrity: Check if the missing file exists in the specified directory. If it's missing, you may need to replace it with a copy from a fresh WordPress installation.

2. Check file permissions: Ensure that the WordPress files and directories have the correct permissions set.

3. Disable plugins and switch to a default theme: If you can access the wp-admin area, try disabling all plugins and switching to a default WordPress theme to rule out conflicts.

4. Reinstall WordPress core files: You can try replacing the core WordPress files with a fresh copy, being careful not to overwrite your wp-content directory or wp-config.php file.

5. Check for available updates: Once you regain access, make sure all components (WordPress core, plugins, and themes) are up to date.

6. Review error logs: Continue monitoring your error logs for any additional information that might help identify the root cause.

If these steps don't resolve the issue, you may need to consider restoring from a recent backup or snapshot of your Lightsail instance from before the problem occurred. If you don't have a recent backup, you might need to set up a new WordPress instance and migrate your content to it.

Remember to always keep regular backups of your WordPress site and Lightsail instance to make recovery easier in situations like this.
      
**Sources**  
[Lightsail Instance showing http 500 error | AWS re:Post](https://repost.aws/questions/QUIOT5h0LxT5GYkcRUrDanEg/lightsail-instance-showing-http-500-error)  
[WordPress site on Lightsail can't connect to any HTTPS resource | AWS re:Post](https://repost.aws/questions/QULhjziyA9Rua6pAFrwnTOww/wordpress-site-on-lightsail-can-t-connect-to-any-https-resource)  
[Error establishing a database connection - Lightsail and Wordpress | AWS re:Post](https://repost.aws/questions/QUqKbQOxn-QseTA7JpT5Naiw/error-establishing-a-database-connection-lightsail-and-wordpress)  
[Resolve WordPress setup errors on Lightsail - Amazon Lightsail](https://docs.aws.amazon.com/lightsail/latest/userguide/wp-setup-common-errors.html)

LightSail Wordpress Error 500

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