Error with Unity Ads after updating?

I have a published game that has been displaying ads and working fine, and I updated my unity and now I am getting a bunch of errors with ads. I currently have ads turned off in services, and initialize them using this line of code:

Code (CSharp):

1. Monetization.Initialize(gameId, testMode);

The following is the main error I am getting, although I am getting a bunch of other conflicts as well:
Library\PackageCache\com.unity.ads@3.4.5\Runtime\Monetization\MonetizationPlatform.cs(113,13): error CS0433: The type 'Advertisement' exists in both 'UnityEngine.Advertisements.Editor, Version=3.0.1.0, Culture=neutral, PublicKeyToken=null' and 'UnityEngine.Advertisements, Version=3.4.2.0, Culture=neutral, PublicKeyToken=null'

An example of another conflict
GUID [db87dc7dfd26443b898812877180d0a4] for asset 'Packages/com.unity.ads/Editor/Resources/Purchase.png' conflicts with:
'Assets/Editor/Resources/Purchase.png' (current owner)
We can't assign a new GUID because the asset is in an immutable folder. The asset will be ignored.

Why is this suddenly not working when I haven't changed anything?

 

Hi, i was having same issue , i just find the solution in this link https://forum.unity.com/threads/cant-upgrade-unity-ads-to-the-latest-version.654598/ .
1. remove unity ads package from your folder
2. go to Packages/manifest.json and remove com.unity.ads dependency
3. reimport unity ads monetization from asset store

 

Thank you so much, that has removed the errors!