Are you trying to resolve WordPress: Class wp_theme not found?
This guide will help you.
WordPress error, Class wp_theme not found happens in the process of upgrading WordPress manually. Basically, this WordPress error can cause the website to load with a blank page.
What triggers the error 'WordPress: Class wp_theme not found' ?
When this happens, you will see an error message such as this:
Class WP_Theme not found in theme.php on line 106
A missing base file is the main factor which cause this error.
How to fix the error 'WordPress: Class wp_theme not found' ?
To perform a manual WordPress upgrade the best way, follow the steps given below:
1. First, we need to get the latest WordPress zip (or tar.gz) file.
2. Then unpack the zip file that we downloaded.
3. After that we have to deactivate plugins.
4. And delete the old wp-includes and wp-admin directories on our web host.
5. Now, using FTP or shell access, we will upload the new wp-includes and wp-admin directories to our web host. Thus overwriting the old files.
6. Next, we will upload the individual files from the new wp-content folder to existing wp-content folder, overwriting existing files.
We should not delete the existing wp-content folder except for the one being overwritten by new files.
7. Finally, we will upload all new loose files from the root directory of the new version to existing WordPress root directory.
Skipping step 7, will lead to 'WordPress: Class wp_theme not found' error message
Therefore, to avoid this issue, or to fix this issue, we must ensure to upload all the files from the root directory of the new version to the existing WordPress root directory.