Cant get ADS working. Missing UnityAssemblies folder

Hi.
I cannot get ADS working.
I have alot of projects with ADS, i know how to do it.
Its only this project the problem.
I have seen a folder inside others projects that is not in my problem project. UnityAssemblies inside Library.

I cannot see this message like others projects
UnityAdsEditor: Initialize(1018474, False);
UnityEditor.Advertisements.UnityAdsEditor:EditorOnLoad()

I have to put this:
Advertisement.Initialize (“xxxx”);

And now i can see in editor.

Hi,

It sounds like you’re using one of the Unity Editor versions that have issues in the services window integration for Ads.

Workaround: update your editor or/and use the Asset Store package (and disable ads from the services window for now).

I cannot get working with package from asset store or using 5.5.1f1 5.5.0f1
I need it to use Advertisement.Initialize (“xxxx”);

—edit.–
In 5.5.2p1 working without Initialize…