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probleam with getDiscoveryAgent()

 
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Hi
i want to use mobile device bluetooth , i use this code but there is probleam with this method getDiscoveryAgent() . this error shown :

Null pointer java/lang/nullpointer exeption


this is my code :

and this is out put on netbeans :

Smart card communication error 0x80100017
The specified reader is not currently available for use
Using Untrusted simulated domain
"Series 40 5th Edition SDK, Feature Pack 1" Instance #6500500 Ready for Future Connections
"Series 40 5th Edition SDK, Feature Pack 1" Connection Terminated


can any body help me ?
thanks
 
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