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

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Any worker thread runs in background, since it is not intended to loop, is not connected to a Looper.for example doInBackground(). its implementation returns will be passed to onPostExecute() which runs on the UI thread.

java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.(
at android.bluetooth.BluetoothAdapter$1.(
at android.bluetooth.BluetoothAdapter.(
at lejos.pc.comm.NXTConnector.connectTo(
at lejos.pc.comm.NXTConnector.connectTo(
at lejos.pc.comm.NXTCommandConnector.getSingletonOpen(
at lejos.nxt.Motor.(
at org.ros.internal.node.DefaultNode$
at org.ros.internal.node.DefaultNode$
at org.ros.concurrent.ListenerCollection$
at java.util.concurrent.ThreadPoolExecutor.runWorker(
at java.util.concurrent.ThreadPoolExecutor$

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