java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.example.bang.stepuptest2.ScannerActivity.onDeviceSelected(ScannerActivity.java:64)
at com.mbientlab.bletoolbox.scanner.BleScannerFragment$2.onItemClick(BleScannerFragment.java:205)
at android.widget.AdapterView.performItemClick(AdapterView.java:299)
at android.widget.AbsListView.performItemClick(AbsListView.java:1156)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:2947)
at android.widget.AbsListView$3.run(AbsListView.java:3681)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:149)
at android.app.ActivityThread.main(ActivityThread.java:5268)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)

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