systemmanager is null

[Nallathambi, Varunkumar]

Hi,
                When I try to use system manager it shows as null. And getting 
error message as Uncaught TypeError: Cannot read property 'measuringElemnt' of 
null.
Var /**@type {mx.manager.SystemManager}*/ 
sm=org.apache.royale.utils.Language.as(this.mx_core_UIText...
If(sm.measuringElement==null)
...

In my code sm/systemmanager is always null.
Kindly help here. Thanks.

Regards,
Varunkumar N