Hello all, newbie question alert.

I have been using Nutch 0.9 and want to try out versions on the trunk.
To do this I have installed the latest build, #743 March 5 2009, and
made the small number of necessary changes for a trial run:
  - add my organization name to conf/nutch-default.xml file
  - add single domain name to conf/crawl-urlfilter.txt (this is an
    intranet crawl)
  - create a single entry urls.txt file

Then I run the nutch crawl command with depth 2 (first trial run) and
get a stack dump.  (See below).

I feel that I've missed something in the installation.  Could someone
tell me what?  Many thanks.

-----------------------------------------------------------------------------------------------------------
Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad
version number in .class file
       at java.lang.ClassLoader.defineClass1(Native Method)
       at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
       at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
       at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
       at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
       at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
       at java.security.AccessController.doPrivileged(Native Method)
       at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
       at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
       at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)

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