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java.lang.NullPointerException: 	at org.apache.zookeeper.server.util.ConfigUtils.getClientConfigStr(ConfigUtils.java:56)	at org.apache.zookeeper.cli.GetConfigCommand.exec(GetConfigCommand.java:64)	at org.apache.zookeeper.ZooKeeperMain.processZKCmd(ZooKeeperMain.java:674)	at org.apache.zookeeper.ZooKeeperMain.processCmd(ZooKeeperMain.java:577)	at org.apache.zookeeper.ZooKeeperMain.executeLine(ZooKeeperMain.java:360)	at org.apache.zookeeper.ZooKeeperMain.run(ZooKeeperMain.java:320)	at org.apache.zookeeper.ZooKeeperMain.main(ZooKeeperMain.java:280)