> ## Documentation Index > Fetch the complete documentation index at: https://docs.kinemation.xyz/llms.txt > Use this file to discover all available pages before exploring further. # CAS with Unity 2022 > This tutorial explains how to use CAS with Unity 2022. If you import CAS into a new Unity 2022 project, this error will occur: ```text theme={null} Assets\KINEMATION\CharacterAnimationSystem\Scripts\Runtime\Playables\AnimationLayeringJobs.cs(27,16): error CS0246: The type or namespace name 'NativeReference<>' could not be found (are you missing a using directive or an assembly reference?) ``` To fix this, make sure to update CAS to the latest version and install the **Collections** package: **Package Manager ▸ Unity Registry ▸ Collections:**