Openfire shows following errors

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at org.jrobin.core.RrdDb.(Unknown Source)
at org.jivesoftware.openfire.reporting.stats.StatsEngine$SampleTask.run(StatsEngin e.java:362)
at java.util.concurrent.Executors$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$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
2016.03.23 11:02:18 org.jivesoftware.util.log.util.CommonsLogFactory - Unable to acquire write lock for status
2016.03.23 11:02:19 org.jivesoftware.openfire.container.PluginManager - error in opening zip file
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.(ZipFile.java:219)
at java.util.zip.ZipFile.(ZipFile.java:149)
at java.util.jar.JarFile.(JarFile.java:166)
at java.util.jar.JarFile.(JarFile.java:130)
at org.jivesoftware.openfire.container.PluginManager$PluginMonitor.unzipPlugin(Plu ginManager.java:1069)
at org.jivesoftware.openfire.container.PluginManager$PluginMonitor.run(PluginManag er.java:961)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301 (ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Schedu ledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
2016.03.23 11:02:35 org.jivesoftware.openfire.reporting.stats.StatsEngine - Error sampling for statistic server_bytes_out
org.jrobin.core.RrdException: Bad sample timestamp 1458711120. Last update time was 1458711120, at least one second step is required
at org.jrobin.core.RrdDb.store(Unknown Source)
at org.jrobin.core.Sample.update(Unknown Source)
at org.jivesoftware.openfire.reporting.stats.StatsEngine$SampleTask.run(StatsEngin e.java:395)
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)
2016.03.23 11:02:39 org.jivesoftware.openfire.container.PluginManager - error in opening zip file
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.(ZipFile.java:219)
at java.util.zip.ZipFile.(ZipFile.java:149)
at java.util.jar.JarFile.(JarFile.java:166)
at java.util.jar.JarFile.(JarFile.java:130)
at org.jivesoftware.openfire.container.PluginManager$PluginMonitor.unzipPlugin(Plu ginManager.java:1069)
at org.jivesoftware.openfire.container.PluginManager$PluginMonitor.run(PluginManag er.java:961)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301 (ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Schedu ledThreadPoolExecutor.java:294)
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)