Hi All,

I have setup latest pack of graylog, elasticsearch and mongodb.
while starting Graylog i m getting following in logs:
2016-09-16 11:37:17,191 ERROR: 
org.graylog.plugins.usagestatistics.UsageStatsClusterPeriodical - Uncaught 
exception in periodical
java.lang.NullPointerException: no value for: mappedWithJournal
        at org.bson.BasicBSONObject.getInt(BasicBSONObject.java:130) 
~[graylog.jar:?]
        at 
org.graylog2.system.stats.mongo.MongoProbe.mongoStats(MongoProbe.java:213) 
~[graylog.jar:?]
        at 
org.graylog2.system.stats.ClusterStatsService.mongoStats(ClusterStatsService.java:113)
 
~[graylog.jar:?]
        at 
org.graylog2.system.stats.ClusterStatsService.clusterStats(ClusterStatsService.java:89)
 
~[graylog.jar:?]
        at 
org.graylog.plugins.usagestatistics.collectors.ClusterCollector.buildClusterStats(ClusterCollector.java:77)
 
~[?:?]
        at 
org.graylog.plugins.usagestatistics.collectors.ClusterCollector.getClusterDataSet(ClusterCollector.java:72)
 
~[?:?]
        at 
org.graylog.plugins.usagestatistics.UsageStatsClusterService$1.get(UsageStatsClusterService.java:52)
 
~[?:?]
        at 
org.graylog.plugins.usagestatistics.UsageStatsClusterService$1.get(UsageStatsClusterService.java:49)
 
~[?:?]
        at 
com.google.common.base.Suppliers$ExpiringMemoizingSupplier.get(Suppliers.java:199)
 
~[graylog.jar:?]
        at 
org.graylog.plugins.usagestatistics.UsageStatsClusterService.buildClusterDataSet(UsageStatsClusterService.java:58)
 
~[?:?]
        at 
org.graylog.plugins.usagestatistics.UsageStatsClusterPeriodical.buildPayload(UsageStatsClusterPeriodical.java:87)
 
~[?:?]
        at 
org.graylog.plugins.usagestatistics.UsageStatsPeriodical.doRun(UsageStatsPeriodical.java:93)
 
~[?:?]
        at 
org.graylog2.plugin.periodical.Periodical.run(Periodical.java:77) 
[graylog.jar:?]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
[?:1.8.0_101]
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) 
[?:1.8.0_101]
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
 
[?:1.8.0_101]
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
 
[?:1.8.0_101]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
[?:1.8.0_101]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
[?:1.8.0_101]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_101]

While the web interface is showing following error:
Error - the server returned: 404 - cannot POST /graylog/system/sessions 
(404)

Please guide.





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