leakcanary: Could not dump heap, previous analysis still is in progress.

More than ten minutes. Android Studio 3.0.1, Android 5.1.1 or 7.1.1 .

public class MyApplication extends Application {
    private RefWatcher refWatcher;

    @Override
    public void onCreate() {
        super.onCreate();
        if (LeakCanary.isInAnalyzerProcess(this)) {
            // This process is dedicated to LeakCanary for heap analysis.
            // You should not init your app in this process.
            return;
        }
        refWatcher=LeakCanary.install(this);
    }

    public static RefWatcher getRefWatcher(Context context){
        MyApplication myApplication= (MyApplication) context.getApplicationContext();
        return myApplication.refWatcher;
    }
}

in Activity class

   @Override
    protected void onDestroy() {
        super.onDestroy();
        MyApplication.getRefWatcher(getApplicationContext()).watch(Main2Activity.this);
    }