Why i got net.rim.device.api.system.ControlledAccessException in blackberry os 5?

I am using ToDo List in my app.It is working fine in simulator but it gives me error in blackberry Strom 9550 like this :

net.rim.device.api.system.ControlledAccessException

Plz help me to solve th开发者_如何学Pythonis error.

Have you checked the app permissions? The simulator gives access to most by default, actual devices do not.

I've also ran into a problem in the past where you might get past it by redeploying a couple times (while the app is running), and occasionally had to uninstall and reboot.