Unity oficial toon shader instalation dont work

im trying to use the oficial unity toon shader with the correct supported version of the editor
https://docs.unity3d.com/Packages/com.unity.toonshader@0.8/manual/index.html
but it will give the following errors and i cant fix them, the script is imutable and it will remove every modification i do, is there any fix for it?

Library\PackageCache\com.unity.film-internal-utilities@0.18.4-preview\Runtime\Scripts\MonoBehaviourSingleton.cs(17,36): error CS0117: ‘Object’ does not contain a definition for ‘FindObjectsByType’
Library\PackageCache\com.unity.film-internal-utilities@0.18.4-preview\Runtime\Scripts\MonoBehaviourSingleton.cs(17,57): error CS0103: The name ‘FindObjectsSortMode’ does not exist in the current context
Library\PackageCache\com.unity.film-internal-utilities@0.18.4-preview\Runtime\Scripts\Utilities\ObjectUtility.cs(14,9): error CS0246: The type or namespace name ‘FindObjectsInactive’ could not be found (are you missing a using directive or an assembly reference?)
Library\PackageCache\com.unity.film-internal-utilities@0.18.4-preview\Runtime\Scripts\Utilities\ObjectUtility.cs(14,69): error CS0103: The name ‘FindObjectsInactive’ does not exist in the current context
Library\PackageCache\com.unity.film-internal-utilities@0.18.4-preview\Runtime\Scripts\Utilities\ObjectUtility.cs(14,99): error CS0103: The name ‘FindObjectsInactive’ does not exist in the current context
Library\PackageCache\com.unity.film-internal-utilities@0.18.4-preview\Runtime\Scripts\Utilities\ObjectUtility.cs(15,35): error CS0117: ‘Object’ does not contain a definition for ‘FindObjectsByType’
Library\PackageCache\com.unity.film-internal-utilities@0.18.4-preview\Runtime\Scripts\Utilities\ObjectUtility.cs(15,77): error CS0103: The name ‘FindObjectsSortMode’ does not exist in the current context