Question: I'm developing an app for iOs using flash air, version 3.8, this version allow me to load a externals swf with assets, flash professional cs6 and flash builder 4.7

I have some kind of lobby where the user select a differents games. If I deploy the app just with 1 game (1 swf), I would loaded a game without problem

But, If I deploy the app with other games, I would just loaded 1 of them swf, but the other games give me this error:

error #2007: parameter possible symbol clash in multiple swfs, abc env must be non-null

The parameter abcenv doesn't exist in my code.

Thanks in advance

Answer: 
You never initialized `paths`:

```
private ArrayList<String> paths = new ArrayList<String>();

```

Note that I've also used a type parameter of `String` here, as you should. In general try to stay away from using [raw types](http://docs.oracle.com/javase/tutorial/java/generics/rawTypes.html).
You have incorrect syntax at this line

```
private ArrayList<String> paths;

```

You are not initializing arraylist properly. in order to initialize it properly you would have to do 

```
private ArrayList<String> paths = new ArrayList<>();

```

Note: I did not put `String` inside `<>` as its redundant in java 1.7.