Class not found exception on launching application in BlackBerry

When I try to launch my application in Blackberry device/simulator, I'm getting class not found exception. This happens for multiple classes like PermissionsManager, CoverageInfo etc.

What I want to know 开发者_运维百科is what all reasons will end up on "Class not found exception" ? What's the best way to troubleshoot this problem ?

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You are launching application created with newer RIM API SDK on device with older device OS software.

ApplicationPermissionsManager class is available for device os 4.2.1 or above.

CoverageInfo class is available for device os 4.2.0 or above.

Seems that you are running your app on device with OS older than 4.2.0

And classes you used just are not implemented in your device software (device OS).