Hey dudes that's so easy. I had the same problem, and it's all related to java version.

Do:

java -version

if it's anything else than:

Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_02-b02)
Java HotSpot(TM) Client VM (build 1.3.1_02-b02, mixed mode)

then you have the wrong java version in your path.

Check in /usr/bin

There should be a symbolic link to java executable.

Remove it with: rm java

Now you need to make a link to the java executable of the Sun JRE kit you just installed for that purpose.

ln -s /usr/java/jre1.3.1/bin/java

now you will have a symlink to the right java executable. I had Kaffe installed and it's totally outdated. go anywhere else in your system and do that:

java -version

Now you should have the right virtual machine version number.

and now try again to start your install.

Good luck!

TMR
tmr.at.iScream.ca
http://www.iscream.ca