One of our beta testers using a T-mobile Galaxy S4 running Android 4.4.4 is experiencing very strange NoClassDefFoundError crashes. I'm completely at a loss for why these could be happening.

The most recent one happens when a static method is called in `onCreateView` in a fragment.

```
MyCustomClass.getNumberOfItems(getActivity());

```

fails with

> 
> Fatal Exception: java.lang.NoClassDefFoundError
>  com.mycompany.myapp.utilities.MyCustomClass$5
> 
> 
> 

Here's the method in question:

```
public static List<Item> getNumberOfItems(final Context context)
{
    List<Item> allFinishedItems = getAllFinishedItems(context);

    CollectionUtils.filter(allFinishedItems, new Predicate<Item>()
    {
        @Override
        public boolean evaluate(Item item)
        {
            // TODO Auto-generated method stub
            return isNonCustomItem(context, item);
        }
    });

    return allFinishedItems;
}

```

1.) what is the "$5" after the class name? (answer: reference to anonymous class for filtering with CollectionUtils.filter)
2.) this user had another crash of similar nature, but with a completely different static method call that's in a library that's included via gradle. The crash I'm referencing in this question is coming from code that is part of my own library project, and the same static method call works in other places in the app. This problem seems to be spreading, or at least not contained to 1 class or 1 library.

We're targeting the following Android versions in build.gradle:

```
minSdkVersion 14
targetSdkVersion 22  (android 5.1)

```

What could possibly be going on here? One other thing to note is that the signed APKs were generated using Android Studio 2.0 preview 4. However, the app works fine for 20-30 other beta testers, so I'm hesitant to point the finger at using a preview version of Studio.