#3 ERROR: engine unknown?

[Sarah Jaworski]

I am running on Windows XP and have MATLAB 7.1 (R14) installed. I have done the following:
1. Added JMatLink.dll to my C:\WINDOWS directory (and added the directory this file is in to my %PATH%
2. Verified that the matlab\bin directory is in my PATH environment variable
3. Added the JMatLink class files (in all directories of the installation) to my %CLASSPATH%.
4. Using Java 1.6.0, typed "java java.ui.SimpleTestGui".

The GUI launches. When I press the "test function" button, I get the following stack trace:
Exception in thread "AWT-EventQueue-0" jmatlink.JMatLinkException: ERROR engine unknown
at jmatlink.CoreJMatLink.engGetVariable(CoreJMatLink.java:567)
at jmatlink.CoreJMatLink.engGetVariable(CoreJMatLink.java:555)
etc...

Are Windows XP, MATLAB 7.1, and Java 1.6.0 supported? Do I need to rebuild JMatLink in order to run in this environment?