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

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java.lang.NullPointerException: 	at com.radiusnetworks.ibeacon.Region.equals(Region.java:149)	at java.util.HashMap.containsKey(HashMap.java:340)	at com.radiusnetworks.ibeacon.service.IBeaconService.startMonitoringBeaconsInRegion(IBeaconService.java:280)	at com.radiusnetworks.ibeacon.service.IBeaconService$IncomingHandler.handleMessage(IBeaconService.java:155)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:136)	at android.app.ActivityThread.main(ActivityThread.java:5479)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)	at dalvik.system.NativeStart.main(Native Method)