OpenFl ByteArray File Loading Problem

[Shareef Raheem]

I need to open a custom file format that is outputted from an as3 air program. Whenever I use 

var bytes:ByteArray = openfl.Assets.getBytes("mapData/TestMap.vktk");

the data is loaded but how do I use it. In as3 I'm using the FileReference Class.

The program crashes when i use any ByteArray method EX:

var mapName = bytes.readUTF();

Invalid operation (<<)

Called from openfl/utils/ByteArray.hx line 403

Called from openfl/utils/ByteArray.hx line 410

Called from Main.hx line 80

Called from Main.hx line 21

Called from Main.hx line 390

Called from E:\SDKs\HaxeToolkit\haxe\std/neko/_std/Reflect.hx line 58

Called from ApplicationMain.hx line 91

Called from openfl/Lib.hx line 113

Thats the error I get in FlashDevelop.

Thanks in advance if you guys can help me(I've been trying to get this to work for a few days).

PS: If you need more info I can give it to you.