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

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This exception has no message.
java.lang.NullPointerException:
at com.gemstone.org.jgroups.protocols.AUTH.up(AUTH.java:134)
at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:768)
at com.gemstone.org.jgroups.protocols.GemFireTimeSync.up(GemFireTimeSync.java:282)
at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:768)
at com.gemstone.org.jgroups.protocols.FRAG2.up(FRAG2.java:259)
at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:768)
at com.gemstone.org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:274)
at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:768)
at com.gemstone.org.jgroups.protocols.UNICAST.up(UNICAST.java:318)
at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:768)
at com.gemstone.org.jgroups.protocols.pbcast.NAKACK.up(NAKACK.java:629)
at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:768)
at com.gemstone.org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:213)
at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:768)
at com.gemstone.org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:569)
at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:768)
at com.gemstone.org.jgroups.protocols.FD.up(FD.java:440)
at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:768)
at com.gemstone.org.jgroups.protocols.Discovery.up(Discovery.java:265)
at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:768)
at com.gemstone.org.jgroups.protocols.TP.handleIncomingMessage(TP.java:1198)
at com.gemstone.org.jgroups.protocols.TP.handleIncomingPacket(TP.java:1110)
at com.gemstone.org.jgroups.protocols.TP.receive(TP.java:1009)
at com.gemstone.org.jgroups.protocols.UDP$UcastReceiver.run(UDP.java:1388)
at java.lang.Thread.run(Thread.java:745)

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