Error message regarding UnityEditor.PluginImporter

Hi, I'm not sure when this error originally popped up,
but it hasn't affected me in any way. (I can still build my project successfully)
The error message pops up every time I press play to test my project.

System.MissingMethodException: Method not found: void UnityEditor.PluginImporter.SetShouldOverridePredicate(System.Predicate`1<string>)
UnityEditor.EditorAssemblies: ProcessInitializeOnLoadAttributes (System.Type[])

I'm wondering if this error message is enough information to find the exact cause.
Thank you and please send help.
AS

 

I got this message today too, any luck?

 

Yep me too

 

Got this error today

TLDR how I fix:
I update the Advertisment package and In App Purchasing

I do a quick gg search in the PlugInImporter doc and there isn't any method called SetShouldOverridePredicate in there
After another gg search for the method name only, I found it mentioned in the CHANGELOG.md of com.unity.ads@2.0.8

[2.0.8] - 2018-05-01



Add call to SetShouldOverridePredicate to exclude package dll when asset store dlls are present.

Update unity version attribute to support 2017.4 LTS



Fix an issue with the editor assembly to add back in some iOS platform specific code 

that was removed via conditionals (which is fine for source packages, but doesn't work with precompiled assemblies)

So I tried to update the com.unity.ads package, got purchasing package error since version conflict or something, update purchasing package, create a project id since they ask for it. After I press play again, the error is gone