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java.lang.NullPointerException: 	at com.megster.cordova.ble.central.Peripheral.registerNotifyCallback(Peripheral.java:318)	at com.megster.cordova.ble.central.Peripheral.processCommands(Peripheral.java:626)	at com.megster.cordova.ble.central.Peripheral.queueCommand(Peripheral.java:592)	at com.megster.cordova.ble.central.Peripheral.queueRegisterNotifyCallback(Peripheral.java:568)	at com.megster.cordova.ble.central.BLECentralPlugin.registerNotifyCallback(BLECentralPlugin.java:413)	at com.megster.cordova.ble.central.BLECentralPlugin.execute(BLECentralPlugin.java:195)	at org.apache.cordova.CordovaPlugin.execute(CordovaPlugin.java:117)	at org.apache.cordova.CordovaPlugin.execute(CordovaPlugin.java:98)	at org.apache.cordova.PluginManager.exec(PluginManager.java:133)	at org.apache.cordova.CordovaBridge.jsExec(CordovaBridge.java:59)	at org.apache.cordova.engine.SystemExposedJsApi.exec(SystemExposedJsApi.java:41)	at com.android.org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)	at com.android.org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:27)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:136)	at android.os.HandlerThread.run(HandlerThread.java:61)