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java.lang.ClassCastException: Cannot cast java.lang.String to org.joda.time.DateTime at java.lang.Class.cast([?:1.8.0_102] at org.graylog2.plugin.Message.getFieldAs([graylog.jar:?] at org.graylog2.plugin.Message.getTimestamp([graylog.jar:?] at org.graylog2.plugins.slack.output.SlackMessageOutput.buildMessage([?:?] at org.graylog2.plugins.slack.output.SlackMessageOutput.write([?:?] at org.graylog2.buffers.processors.OutputBufferProcessor$[graylog.jar:?] at com.codahale.metrics.InstrumentedExecutorService$[graylog.jar:?] at java.util.concurrent.Executors$[?:1.8.0_102] at[?:1.8.0_102] at java.util.concurrent.ThreadPoolExecutor.runWorker([?:1.8.0_102] at java.util.concurrent.ThreadPoolExecutor$[?:1.8.0_102] at[?:1.8.0_102]