Osmosis Update Error

/osmosis/bin/osmosis --read-replication-interval workingDirectory=/root/Nominatim/settings --simplify-change --write-xml-change /root/Nominatim/data/osmosischange.osc

Jun 25, 2013 10:34:41 AM org.openstreetmap.osmosis.core.Osmosis run
INFO: Osmosis Version 0.42
Jun 25, 2013 10:34:42 AM org.java.plugin.registry.xml.ManifestParser <init>
INFO: got SAX parser factory - org.apache.xerces.jaxp.SAXParserFactoryImpl@292d15a9
Jun 25, 2013 10:34:42 AM org.java.plugin.registry.xml.PluginRegistryImpl configure
INFO: configured, stopOnError=false, isValidating=true
Jun 25, 2013 10:34:42 AM org.java.plugin.registry.xml.PluginRegistryImpl register
INFO: plug-in and fragment descriptors registered - 1
Jun 25, 2013 10:34:42 AM org.java.plugin.standard.StandardPluginManager activatePlugin
INFO: plug-in started - [email protected]
Jun 25, 2013 10:34:42 AM org.openstreetmap.osmosis.core.Osmosis run
INFO: Preparing pipeline.
Jun 25, 2013 10:34:42 AM org.openstreetmap.osmosis.core.Osmosis run
INFO: Launching pipeline execution.
Jun 25, 2013 10:34:42 AM org.openstreetmap.osmosis.core.Osmosis run
INFO: Pipeline executing, waiting for completion.
Jun 25, 2013 10:34:42 AM org.openstreetmap.osmosis.core.pipeline.common.ActiveTaskManager waitForCompletion
SEVERE: Thread for task 1-read-replication-interval failed
java.lang.NullPointerException
        at org.openstreetmap.osmosis.replication.v0_6.impl.ReplicationDownloaderConfiguration.getBaseUrl(ReplicationDownloaderConfiguration.java:47)
        at org.openstreetmap.osmosis.replication.v0_6.BaseReplicationDownloader.runImpl(BaseReplicationDownloader.java:288)
        at org.openstreetmap.osmosis.replication.v0_6.BaseReplicationDownloader.run(BaseReplicationDownloader.java:381)
        at java.lang.Thread.run(Thread.java:679)
Jun 25, 2013 10:34:42 AM org.openstreetmap.osmosis.core.Osmosis main
SEVERE: Execution aborted.
org.openstreetmap.osmosis.core.OsmosisRuntimeException: One or more tasks failed.
        at org.openstreetmap.osmosis.core.pipeline.common.Pipeline.waitForCompletion(Pipeline.java:146)
        at org.openstreetmap.osmosis.core.Osmosis.run(Osmosis.java:92)
        at org.openstreetmap.osmosis.core.Osmosis.main(Osmosis.java:37)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:329)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:239)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:47)
Error: 1