org.graylog2.plugin.inputs.MisfireException: java.lang.NullPointerException: scheme

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org.graylog2.plugin.inputs.MisfireException: 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$BoundRequestBuilder.setUrl(AsyncHttpClient.java:308)
at com.ning.http.client.AsyncHttpClient.requestBuilder(AsyncHttpClient.java:596)
at org.graylog2.plugin.httpmonitor.HttpMonitorTransport$MonitorTask.buildRequest(HttpMonitorTransport.java:285)
at org.graylog2.plugin.httpmonitor.HttpMonitorTransport$MonitorTask.(HttpMonitorTransport.java:174)
at org.graylog2.plugin.httpmonitor.HttpMonitorTransport.startMonitoring(HttpMonitorTransport.java:151)
at org.graylog2.plugin.httpmonitor.HttpMonitorTransport.launch(HttpMonitorTransport.java:132)
at java.util.concurrent.Executors$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)

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