'ArgumentException: Requested value 'X86' was not found.'

i try to import GoogleMobileAds sdk to unity. when i import PlayServicesResolver package, i am getting error on console like this 'ArgumentException: Requested value 'X86' was not found.' I cant figure out why?

ArgumentException: Requested value 'X86' was not found. System.Enum+EnumResult.SetFailure (System.Enum+ParseFailureKind failure, System.String failureMessageID, System.Object failureMessageFormatArgument) (at :0) System.Enum.TryParseEnum (System.Type enumType, System.String value, System.Boolean ignoreCase, System.Enum+EnumResult& parseResult) (at :0) System.Enum.Parse (System.Type enumType, System.String value, System.Boolean ignoreCase) (at :0) System.Enum.Parse (System.Type enumType, System.String value) (at :0) GooglePlayServices.AndroidAbis.EnumValueStringToULong (System.Type enumType, System.String enumValueString) (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/AndroidAbis.cs:220) GooglePlayServices.AndroidAbis.get_Current () (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/AndroidAbis.cs:278) GooglePlayServices.PlayServicesResolver.m__1B () (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/PlayServicesResolver.cs:1201) GooglePlayServices.PlayServicesResolver+PropertyPoller`1[T].Poll (System.Func`1[TResult] getCurrentValue, GooglePlayServices.PlayServicesResolver+PropertyPoller`1+Changed[T] changed) (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/PlayServicesResolver.cs:278) GooglePlayServices.PlayServicesResolver.PollAndroidAbis () (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/PlayServicesResolver.cs:1201) UnityEditor.EditorApplication.Internal_CallUpdateFunctions () (at C:/buildslave/unity/build/Editor/Mono/EditorApplication.cs:303) ,i try to import GoogleMobileAds sdk to unity. when i import PlayServicesResolver package, i am getting error on console like this 'ArgumentException: Requested value 'X86' was not found.' I cant figure out why?