neo4j startup error

SEVERE:
java.lang.RuntimeException: Error starting org.neo4j.kernel.EmbeddedGraphDatabase, /home/ubuntu/neo4j-community-2.0.0-M04/data/graph_dec_03_2013.db
    at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:319)
    at org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:100)
    at org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:92)
    at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:197)
    at org.neo4j.kernel.impl.recovery.StoreRecoverer.recover(StoreRecoverer.java:115)
    at org.neo4j.server.preflight.PerformRecoveryIfNecessary.run(PerformRecoveryIfNecessary.java:59)
    at org.neo4j.server.preflight.PreFlightTasks.run(PreFlightTasks.java:70)
    at org.neo4j.server.AbstractNeoServer.runPreflightTasks(AbstractNeoServer.java:306)
    at org.neo4j.server.AbstractNeoServer.start(AbstractNeoServer.java:133)
    at org.neo4j.server.Bootstrapper.start(Bootstrapper.java:86)
    at org.neo4j.server.Bootstrapper.main(Bootstrapper.java:49)
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.extension.KernelExtensions@4737dfab' was successfully initialized, but failed to start. Please see attached cause exception.
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:504)
    at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:115)
    at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:296)
    ... 10 more
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.index.lucene.LuceneKernelExtension@1ecbec08' was successfully initialized, but failed to start. Please see attached cause exception.
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:504)
    at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:115)
    at org.neo4j.kernel.extension.KernelExtensions.start(KernelExtensions.java:124)
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:498)
    ... 12 more
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.index.impl.lucene.LuceneDataSource@1fdddcd0' was successfully initialized, but failed to start. Please see attached cause exception.
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:504)
    at org.neo4j.kernel.lifecycle.LifeSupport.bringToState(LifeSupport.java:411)
    at org.neo4j.kernel.lifecycle.LifeSupport.add(LifeSupport.java:324)
    at org.neo4j.kernel.impl.transaction.XaDataSourceManager.registerDataSource(XaDataSourceManager.java:237)
    at org.neo4j.index.lucene.LuceneKernelExtension.start(LuceneKernelExtension.java:79)
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:498)
    ... 15 more
Caused by: java.lang.OutOfMemoryError: Java heap space
    at org.neo4j.kernel.impl.util.IoPrimitiveUtils.readString(IoPrimitiveUtils.java:47)
    at org.neo4j.kernel.impl.util.IoPrimitiveUtils.readLengthAndString(IoPrimitiveUtils.java:40)
    at org.neo4j.index.impl.lucene.LuceneCommand.readCommand(LuceneCommand.java:453)
    at org.neo4j.index.impl.lucene.LuceneDataSource$LuceneCommandFactory.readCommand(LuceneDataSource.java:391)
    at org.neo4j.kernel.impl.transaction.xaframework.LogIoUtils.readTxCommandEntry(LogIoUtils.java:175)
    at org.neo4j.kernel.impl.transaction.xaframework.LogIoUtils.readLogEntry(LogIoUtils.java:113)
    at org.neo4j.kernel.impl.transaction.xaframework.LogIoUtils.readEntry(LogIoUtils.java:90)
    at org.neo4j.kernel.impl.transaction.xaframework.XaLogicalLog.readEntry(XaLogicalLog.java:834)
    at org.neo4j.kernel.impl.transaction.xaframework.XaLogicalLog.doInternalRecovery(XaLogicalLog.java:770)
    at org.neo4j.kernel.impl.transaction.xaframework.XaLogicalLog.open(XaLogicalLog.java:208)
    at org.neo4j.kernel.impl.transaction.xaframework.XaLogicalLog.open(XaLogicalLog.java:163)
    at org.neo4j.kernel.impl.transaction.xaframework.XaContainer.openLogicalLog(XaContainer.java:64)
    at org.neo4j.index.impl.lucene.LuceneDataSource.start(LuceneDataSource.java:277)
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:498)
    at org.neo4j.kernel.lifecycle.LifeSupport.bringToState(LifeSupport.java:411)
    at org.neo4j.kernel.lifecycle.LifeSupport.add(LifeSupport.java:324)
    at org.neo4j.kernel.impl.transaction.XaDataSourceManager.registerDataSource(XaDataSourceManager.java:237)
    at org.neo4j.index.lucene.LuceneKernelExtension.start(LuceneKernelExtension.java:79)
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:498)
    at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:115)
    at org.neo4j.kernel.extension.KernelExtensions.start(KernelExtensions.java:124)
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:498)
    at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:115)
    at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:296)
    at org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:100)
    at org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:92)
    at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:197)
    at org.neo4j.kernel.impl.recovery.StoreRecoverer.recover(StoreRecoverer.java:115)
    at org.neo4j.server.preflight.PerformRecoveryIfNecessary.run(PerformRecoveryIfNecessary.java:59)
    at org.neo4j.server.preflight.PreFlightTasks.run(PreFlightTasks.java:70)
    at org.neo4j.server.AbstractNeoServer.runPreflightTasks(AbstractNeoServer.java:306)
    at org.neo4j.server.AbstractNeoServer.start(AbstractNeoServer.java:133)

Apr 21, 2014 3:54:10 PM org.neo4j.server.logging.Logger log
SEVERE: Failed to start Neo Server on port [7474]