java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.orientechnologies.lucene.engine.OLuceneIndexEngineDelegate.flush(OLuceneIndexEngineDelegate.java:69)
at com.orientechnologies.orient.server.distributed.impl.ODistributedStorage.synch(ODistributedStorage.java:1462)
at com.orientechnologies.orient.core.index.OIndexManagerShared.createIndex(OIndexManagerShared.java:197)
at com.orientechnologies.orient.core.index.OIndexManagerProxy.createIndex(OIndexManagerProxy.java:87)
at com.orientechnologies.orient.core.metadata.schema.OClassImpl.createIndex(OClassImpl.java:1871)
at com.orientechnologies.orient.core.sql.OCommandExecutorSQLCreateIndex.execute(OCommandExecutorSQLCreateIndex.java:277)
at com.orientechnologies.orient.core.sql.OCommandExecutorSQLDelegate.execute(OCommandExecutorSQLDelegate.java:74)
at com.orientechnologies.orient.core.storage.impl.local.OAbstractPaginatedStorage.executeCommand(OAbstractPaginatedStorage.java:2677)
at com.orientechnologies.orient.server.distributed.impl.ODistributedStorage$2.call(ODistributedStorage.java:314)
at com.orientechnologies.orient.server.distributed.impl.ODistributedStorage.command(ODistributedStorage.java:311)
at com.orientechnologies.orient.server.network.protocol.binary.ONetworkProtocolBinary.command(ONetworkProtocolBinary.java:1438)
at com.orientechnologies.orient.server.network.protocol.binary.ONetworkProtocolBinary.executeRequest(ONetworkProtocolBinary.java:576)
at com.orientechnologies.orient.server.network.protocol.binary.ONetworkProtocolBinary.sessionRequest(ONetworkProtocolBinary.java:321)

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