The problem is that I don't know how to fix it

[said19846]

Hi

unity5.6 NullReferenceException: Object reference not set to an instance of an object GooglePlayServices.AndroidSdkManager+c_AnonStoreyA.<>mC (GooglePlayServices.AndroidSdkPackageCollection packages) GooglePlayServices.SdkManager+cAnonStorey9.<>mB (GooglePlayServices.Result result) GooglePlayServices.SdkManagerUtil+cAnonStorey4.<>m_4 (GooglePlayServices.Result result) GooglePlayServices.CommandLineDialog+ProgressReporter.Update (GooglePlayServices.CommandLineDialog window) GooglePlayServices.CommandLineDialog.Update () System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222) Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation. System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232) System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115) UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:262) UnityEditor.HostView.Invoke (System.String methodName) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:255) UnityEditor.HostView.SendUpdate () (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:330) UnityEditor.EditorApplication.Internal_CallUpdateFunctions () (at C:/buildslave/unity/build/artifacts/generated/common/editor/EditorApplicationBindings.gen.cs:249)