Internal error occured?

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Anonymous
Internal error occured?

I tried to install Tigase Server 5.0.0 with JDK 1.6.0_24 and I have an error:

[ Starting to unpack ]
[ Processing package: Base (1/9) ]
[ Processing package: Unix Files (2/9) ]
[ Processing package: Docs (3/9) ]
[ Processing package: Extras (4/9) ]
[ Unpacking finished ]
[ ERROR: Internal error occured : java.io.EOFException ]
java.io.EOFException
at java.io.DataInputStream.readInt(DataInputStream.java:392)
at java.io.ObjectInputStream$BlockDataInputStream.readInt(ObjectInputStream.java:2792)
at java.io.ObjectInputStream.readInt(ObjectInputStream.java:967)
at com.izforge.izpack.installer.Unpacker.run(Unknown Source)
at java.lang.Thread.run(Thread.java:636)

Does anyone know what this means? I searched the FAQ and found a similar error for an older version of Tigase, but it doesn't seem to have been fixed.