'The type or namespace name `PostProcessing' does not exist in the namespace `UnityEngine.Rendering'

Do someone know how to fix this? I got this error after importing Cinemachine from the Unity Asset Store. I'm using Unity 2018.1.0f2 and have no problems with 2017.3.1f1

Error

The type or namespace name PostProcessing does not exist in the namespace UnityEngine.Rendering



Solution 1:[1]

Using Unity 2018.2 --

Go to Window>Package Manager Click on the All tab Find Postprossessing and import Find Cinemachine and import

Solution 2:[2]

here's something that should work - it worked for me! go to window > package manager. search for postprocessing and click install. wait for it to download. close package manager. DONE!

Solution 3:[3]

The Way I found to Fix This Error is This:
1. go to Window -> package manager
2. select post-processing
3. click on version and select old version
4. click Up to date

Sources

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Source: Stack Overflow

Solution Source
Solution 1 LightOwl
Solution 2 Douglas
Solution 3 MartenCatcher