[flexcoders] errror when compile at sdk 4

[cholid cholid]

Hi all
im just compile my application that build on flex sdk 3 on sdk 4
has message error that's
Error: Access of possibly undefined property FlexGlobals through a reference 
with static type Class.

                                return 
Application.FlexGlobals.topLevelApplication as ZenNetMap;


anyone same trouble?
or anyones have trouble when compile on sdk 4 to but on different case?