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

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This exception has no message.
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This exception has no message.
java.lang.NullPointerException:
at java.util.StringTokenizer.(StringTokenizer.java:199)
at java.util.StringTokenizer.(StringTokenizer.java:221)
at org.apache.zookeeper.ZooKeeperMain$MyCommandOptions.parseCommand(ZooKeeperMain.java:219)
at org.apache.zookeeper.ZooKeeperMain.processZKCmd(ZooKeeperMain.java:638)
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)

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