title: error CS0117: 'EditorSceneManager' does not contain a definition for 'IsGameObjectInScene'
body: <p>an error shows i cant make the build in unity 2018.3.8</p>
  
  <p>i try to copy all assets to another folder but still error show </p>
  
  <p>i am really stuck to resolve it</p>
  
  <p>Library\PackageCache\com.unity.postprocessing@2.0.3-preview\PostProcessing\Runtime\PostProcessManager.cs(424,66): error CS0117: 'EditorSceneManager' does not contain a definition for 'IsGameObjectInScene'</p>