Deactivate/Activate Datasets for Model target

Hi I am using Unity 2017.3.1f1 and latest Vuforia with it.

I am trying to understand Model Target but the documenation I find and posts are all not up to date or just doesn't have my issue described.

I have 3 model targets (which will be many more if this succeeds)

Now, it doesn't seem to work to load 3 model target databases and have them activated since vuforia will throw "Could not activate dataset" on every dataset except the first. I then tried to only activate any 1 of them first and not click in "activate" on the other 2. This worked.

But then when I try to deactivate one dataset and activate the next I always get the same error (could not activate/deactivate dataset)

How on earth should I write code to change the activated dataset in runtime?

I have tried to do something like this;

ObjectTracker objectTracker = TrackerManager.Instance.GetTracker<ObjectTracker>();

        IEnumerable<DataSet> dataSets = objectTracker.GetDataSets();

        int index = 0;

        DataSet activeDataSet = null;

        foreach(DataSet ds in dataSets)         {             if(index == currentIndex)             {                 activeDataSet = ds;

break;             }             else             {                 index++;             }         }         objectTracker.Stop();         objectTracker.DeactivateDataSet(activeDataSet);

        models[currentIndex].SetActive(false);

        currentIndex = (currentIndex + 1) % models.Length;

        activeDataSet = null;

        foreach (DataSet ds in dataSets)         {             if (index == currentIndex)             {                 activeDataSet = ds;

break;             }             else             {                 index++;             }         }

        objectTracker.ActivateDataSet(activeDataSet);         objectTracker.Start();

But this code does not work! I have tried many versions of the above code but none of them managed to do this. Please help me!