If your PrestaShop store displays the following error:
Fatal error: Declaration of AdminLoginControllerCore::viewAccess() must be compatible with AdminControllerCorethe issue is often related to PHP version compatibility.
This error may occur after:
- Migrating a store to a new hosting environment
- Updating the server configuration
- Restoring a backup
- Changing the PHP version
- Running an older version of PrestaShop on a newer PHP release
In many cases, switching to a PHP version supported by your PrestaShop installation resolves the problem.
Table of Contents
Change the PHP Version in the mybox Panel
Step 1: Open the Websites Section
Log in to the mybox Panel.
Navigate to the Websites section.
Step 2: Edit the Website Settings
Locate the website affected by the error.
Click Actions next to the website and select Edit.
Step 3: Select a Different PHP Version
In the website settings, locate the PHP version selector.
Choose the PHP version recommended for your PrestaShop installation.
Click Save to apply the changes.
What to Expect
PHP version changes are not applied immediately.
In most cases, the new configuration becomes active within a few minutes after saving the settings.
Once the change has been applied, refresh your website and verify whether the error has been resolved.
If the Error Persists
If changing the PHP version does not resolve the issue, additional investigation may be required.
Possible causes include:
- Outdated PrestaShop files
- Incompatible modules
- Custom modifications to the store
- Incomplete updates or migrations
Checking the PHP error logs can help identify the exact source of the problem.
Summary
The error indicating that AdminLoginControllerCore::viewAccess() is not compatible with AdminControllerCore is commonly caused by PHP version incompatibilities. Switching to a PHP version supported by your PrestaShop installation is often sufficient to restore normal operation of the store.