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java.lang.NullPointerException: scheme	at com.ning.http.client.uri.Uri.(Uri.java:56)	at com.ning.http.client.uri.Uri.create(Uri.java:32)	at com.ning.http.client.uri.Uri.create(Uri.java:25)	at com.ning.http.client.RequestBuilderBase.setUrl(RequestBuilderBase.java:307)	at com.ning.http.client.AsyncHttpClient$BoundRequestBuilder.setUrl(AsyncHttpClient.java:308)	at com.ning.http.client.AsyncHttpClient.requestBuilder(AsyncHttpClient.java:596)	at com.ning.http.client.AsyncHttpClient.prepareGet(AsyncHttpClient.java:402)	at org.graylog2.plugin.httpmonitor.HttpMonitorTransport$MonitorTask.buildRequest(HttpMonitorTransport.java:285)	at org.graylog2.plugin.httpmonitor.HttpMonitorTransport$MonitorTask.(HttpMonitorTransport.java:174)	at org.graylog2.plugin.httpmonitor.HttpMonitorTransport.startMonitoring(HttpMonitorTransport.java:151)	at org.graylog2.plugin.httpmonitor.HttpMonitorTransport.launch(HttpMonitorTransport.java:132)	at org.graylog2.plugin.inputs.MessageInput.launch(MessageInput.java:160)	at org.graylog2.shared.inputs.InputLauncher$1.run(InputLauncher.java:84)	at com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:176)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)