Ошибка Library\PackageCache\[email protected]\IK\Editor\Inspectors\IKManager2DEditor.cs(8,23): error CS0234

При создании проекта выдает такую ошибку.

Library\PackageCache\[email protected]\IK\Editor\Inspectors\IKManager2DEditor.cs(8,23): error CS0234: The type or namespace name 'Animation' does not exist in the namespace 'UnityEditor.U2D' (are you missing an assembly reference?)