Update to PHP 8.1

Hi Kyle,
Am currently trying to update the website to run on PHP 8.1.
I now have the following problem that is indicated in my backend (loads of references to CBLib...):Deprecated: Return type of CBLib\DependencyInjection\Container::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in joomla/libraries/CBLib/CBLib/DependencyInjection/Container.php on line 894 Deprecated: Return type of CBLib\DependencyInjection\Container::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in joomla/libraries/CBLib/CBLib/DependencyInjection/Container.php on line 905 Deprecated: Return type of CBLib\DependencyInjection\Container::offsetSet($key, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in joomla/libraries/CBLib/CBLib/DependencyInjection/Container.php on line 917 Deprecated: Return type of CBLib\DependencyInjection\Container::offsetUnset($key) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in joomla/libraries/CBLib/CBLib/DependencyInjection/Container.php on line 939 Deprecated: Return type of CBLib\DependencyInjection\Container::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in joomla/libraries/CBLib/CBLib/DependencyInjection/Container.php on line 894 Deprecated: Return type of CBLib\DependencyInjection\Container::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in joomla/libraries/CBLib/CBLib/DependencyInjection/Container.php on line 905 Deprecated: Return type of CBLib\DependencyInjection\Container::offsetSet($key, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in joomla/libraries/CBLib/CBLib/DependencyInjection/Container.php on line 917 Deprecated: Return type of CBLib\DependencyInjection\Container::offsetUnset($key) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in joomla/libraries/CBLib/CBLib/DependencyInjection/Container.php on line 939
Where does it come from and how do I resolve it

Kind regards,

Tim
 

That should already be fixed. Please be sure you've latest CB build release installed. If you're on Joomla 3 do not move to PHP 8.1 as Joomla 3 will throw a lot of deprecation notices. They're also just deprecation notices that you don't really need to be concerned about and can suppress them by setting debug mode to None or if needed for debugging set to Simple.