System.Reflection.AmbiguousMatchException error

[Paulux92500]

System.Reflection.AmbiguousMatchException: Ambiguous match found.
at System.RuntimeType.GetMethodImplCommon (System.String name, System.Int32 genericParameterCount, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Reflection.CallingConventions callConv, System.Type[] types, System.Reflection.ParameterModifier[] modifiers) [0x00050] in <467a840a914a47078e4ae9b0b1e8779e>:0
at System.RuntimeType.GetMethodImpl (System.String name, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Reflection.CallingConventions callConv, System.Type[] types, System.Reflection.ParameterModifier[] modifiers) [0x00000] in <467a840a914a47078e4ae9b0b1e8779e>:0
at System.Type.GetMethod (System.String name, System.Reflection.BindingFlags bindingAttr) [0x0000e] in <467a840a914a47078e4ae9b0b1e8779e>:0
at System.Type.GetMethod (System.String name) [0x00000] in <467a840a914a47078e4ae9b0b1e8779e>:0
at GooglePlayServices.UnityCompat.get_Unity56AndAboveApplicationIdentifier () [0x00000] in <21a8cb51df0d4941915e31d35b4c9857>:0
at GooglePlayServices.UnityCompat.get_ApplicationId () [0x00000] in <21a8cb51df0d4941915e31d35b4c9857>:0
at GooglePlayServices.PlayServicesResolver..cctor () [0x00020] in <21a8cb51df0d4941915e31d35b4c9857>:0
UnityEditor.EditorAssemblies:ProcessInitializeOnLoadAttributes (System.Type[])