Every time I open unity project it gives me errors and as I am very new to game development, I don’t understand what these errors I tried to google it and find everywhere but I didn’t get any solutions.
These errors are like :-

  1. ReleaseAllScriptsCashes
  2. Null ReferenceException
  3. The type or namespace name ‘Cinemachine’ could not be found (are you missing a using directive or an assembly reference?)
  4. The type or namespace name ‘PostProcessing’ does not exist in the namespace ‘UnityEngine.Rendering’ (are you missing an assembly reference?)
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    and many more kindly please help I am stuck. Here is the reference image of errors

It seems to be missing Cinemachine and PostProcessing so I tried to go to window->Package Manager and install these packages and the errors gone away.