[flexcoders] mx.utils.ArrayUtil missing in AS3 project

I don't know if this is because it is an AS3 project and not an MXML project but I'm running into this error when I try to use the ArrayUtil class: 1202: Access of undefined property ArrayUtil in package mx.utils. Is this class not available in an AS project? An really the code complete for

RE: [flexcoders] mx.utils.ArrayUtil missing in AS3 project

:15 AM To: flexcoders@yahoogroups.com Subject: [flexcoders] mx.utils.ArrayUtil missing in AS3 project I don't know if this is because it is an AS3 project and not an MXML project but I'm running into this error when I try to use the ArrayUtil class: 1202: Access of undefined property ArrayUtil