Using external libs with SunToolKit Fails.

I am trying to compile an external class in J2ME SunToolKit.
This is what I have done. My class is in:
net.test.myClass.class
I preverify the class. This workd fine.
Then I create a zip file with the preverify class and add the zip file to the lib folder in my app folder created by the tool kit. Just as the user guide says.
Then I try to build my application which uses this class. I get a :
JAR file creation failed with error -1
The preverified classes if any are in tmpdir.
com.sun.kvem.ktools.ExecutionException: Preverifier returned 1
Build failed
Now I notice that if I try to run preverify directly from the command line on the zip file I created I get the same error.
What is the problem. Is there a step I am missing.
Note I do not have a manifest file in my zip.
Also I am using the latest version of all the software
JRE 1.3_02
SDK 1.3_02
and Wireless ToolKit 1.3
Please help. I can not figure out a way to solve this problem.

No not at all. I made sure of that.
As a matter of fact I got things to compile and preverify fine when I do it outside the toolkit (commandline) I only see this problem with the toolkit. I am using version 1.3.

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