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After updating to WHMCS 8.4.0, you may observe the following setLabel error:
Whoops\Exception\ErrorException: Declaration of WHMCS\View\Menu\Item::setLabel($label): Knp\Menu\ItemInterface must be compatible with Knp\Menu\MenuItem::setLabel(?string $label): Knp\Menu\ItemInterface in /var/www/html/billing/vendor/whmcs/whmcs-foundation/lib/View/Menu/Item.php:0Solution
Update ionCube® Loader on your server to the newest available stable version.
For help with updating ionCube Loader, contact your hosting provider or system administrator.
HotFix
A hotfix has been created for 8.4.0 only to correct this behavior:
https://whmcs.community/files/file/172-core-17437-client-area-declaration-error-in-setlabel-method/
Workaround
If you cannot update ionCube Loader, you can use the following alternate method:
- Download the 8.3.2 Full Release files.
- Extract the
/vendor/whmcs/whmcs-foundation/lib/View/Menu/Item.phpfile. - Upload the file to the
/vendor/whmcs/whmcs-foundation/lib/View/Menu/directory, overwriting the current file.
After you have updated ionCube Loader on your server, you can restore the Item.php file from WHMCS 8.4.0.
