Solved: Fatal Error: Uncaught Error: Call to a Member Function getSectionNames() After Upgrading Magento 2

March 22, 2023

If you have recently upgraded your Magento 2 store and encountered a fatal error with the message "Uncaught Error: Call to a Member Function getSectionNames()", don't panic. This error is quite common after upgrading Magento 2, and fortunately, it can be resolved quickly.

The error message typically appears when Magento 2 is unable to find a specific file or resource, usually due to a misconfiguration or compatibility issue. There are several possible causes of this error, but the most common are related to caching or permissions.

To fix this issue, follow these steps:

1. Clear the Cache

One of the most common reasons for this error is a caching issue. Magento 2 uses caching extensively to speed up page loading times, but sometimes cached data can become corrupted or outdated. To fix this issue, you can try clearing the Magento 2 cache.

To do this, navigate to your Magento 2 root directory and run the following command:

php bin/magento cache:clean

This will clear all of the cached data in your Magento 2 store.

2. Fix Permissions

Another possible cause of this error is a permissions issue. Magento 2 requires specific file and directory permissions to function correctly. If these permissions are not set correctly, you may encounter this error.

To fix this issue, navigate to your Magento 2 root directory and run the following commands:

sudo chown -R www-data:www-data .

sudo find . -type d -exec chmod 770 {} ;

sudo find . -type f -exec chmod 660 {} ;

sudo chmod u+x bin/magento

These commands will set the correct permissions for your Magento 2 store.

3. Upgrade Magento 2

If neither of the above solutions works, you may need to upgrade your Magento 2 store to the latest version. Upgrading Magento 2 can be a complex process, and it's essential to follow the official upgrade guide carefully.

To upgrade your Magento 2 store, follow these steps:

a. Backup your Magento 2 store files and database.

b. Disable all custom extensions and themes.

c. Download the latest version of Magento 2 from the official website.

d. Extract the Magento 2 archive and upload the files to your Magento 2 root directory.

e. Run the following commands to upgrade Magento 2:

php bin/magento maintenance:enable

composer install

php bin/magento setup:upgrade

php bin/magento setup:di:compile

php bin/magento setup:static-content:deploy -f

php bin/magento cache:clean

php bin/magento maintenance:disable

f. Re-enable your custom extensions and themes.

In conclusion, the "Uncaught Error: Call to a Member Function getSectionNames()" error is a common issue in Magento 2 after upgrading. Fortunately, it's straightforward to fix by clearing the cache, fixing permissions, or upgrading your Magento 2 store. By following the steps outlined in this article, you should be able to resolve this error and get your Magento 2 store back up and running in no time.