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java.lang.ClassCastException: Cannot cast java.lang.String to org.joda.time.DateTime at java.lang.Class.cast(Class.java:3369)[?:1.8.0_102] at org.graylog2.plugin.Message.getFieldAs(Message.java:380)[graylog.jar:?] at org.graylog2.plugin.Message.getTimestamp(Message.java:178)[graylog.jar:?] at org.graylog2.plugins.slack.output.SlackMessageOutput.buildMessage(SlackMessageOutput.java:97)[?:?] at org.graylog2.plugins.slack.output.SlackMessageOutput.write(SlackMessageOutput.java:67)[?:?] at org.graylog2.buffers.processors.OutputBufferProcessor$1.run(OutputBufferProcessor.java:189)[graylog.jar:?] at com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:176)[graylog.jar:?] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[?:1.8.0_102] at java.util.concurrent.FutureTask.run(FutureTask.java:266)[?:1.8.0_102] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[?:1.8.0_102] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[?:1.8.0_102] at java.lang.Thread.run(Thread.java:745)[?:1.8.0_102]