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org.apache.hadoop.hdfs.server.namenode.NameNode: java.lang.NullPointerException	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:1099)	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:1111)	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.unprotectedMkdir(FSDirectory.java:996)	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.unprotectedMkdir(FSDirectory.java:983)	at org.apache.hadoop.hdfs.server.namenode.FSEditLog.loadFSEdits(FSEditLog.java:712)	at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSEdits(FSImage.java:1021)	at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:839)	at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:377)	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:100)	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:388)	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.(FSNamesystem.java:362)	at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:276)	at org.apache.hadoop.hdfs.server.namenode.NameNode.(NameNode.java:496)	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1279)	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1288)