Repository related error while starting JBoss Portal

Issue

• While starting the JBoss EPP, below errors are logged in the server.log file

2013-11-22 01:23:39,740 ERROR [exo.jcr.component.core.RepositoryServiceImpl] Error start repository service
org.exoplatform.services.jcr.config.RepositoryConfigurationException: Repository container repository was not started.
    at org.exoplatform.services.jcr.impl.RepositoryServiceImpl.createRepository(RepositoryServiceImpl.java:171)
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Caused by: org.picocontainer.PicoIntrospectionException: Failed when calling start on org.exoplatform.services.jcr.impl.WorkspaceContainer@64c5fe9b
    at org.exoplatform.container.LifecycleVisitor.traverse(LifecycleVisitor.java:136)
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Caused by: javax.jcr.RepositoryException: fail to create index dir /shared/jcr/lucene/system_ecmdemo_system
    at org.exoplatform.services.jcr.impl.core.query.lucene.SearchIndex.doInit(SearchIndex.java:620)
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