Proguard Error with ant/antenna

I get the following proguard error:
[wtkobfuscate] java.io.IOException: The output jar is empty. Did you specify
the proper '-keep' optons?
Any idea what is wrong?
Thanks,
earamsey

[b][u]------- actual ant output: ------------[/u][/b]
[wtkobfuscate] Obfuscating C:\Projects\J2ME\CellStory\bin\CellStory.jar with
ProGuard
[wtkobfuscate] ProGuard, version 3.2
[wtkobfuscate] Reading jars...
[wtkobfuscate] Reading program jar
[C:\Projects\J2ME\CellStory\bin\CellStory.jar]
[wtkobfuscate] Reading library zip
[C:\WTK22\wtklib\devices\Series_60_MIDP_SDK_2_1\lib\kmidp20.zip]
[wtkobfuscate] Removing unused library classes...
[wtkobfuscate] Original number of library classes: 305
[wtkobfuscate] Final number of library classes: 6
[wtkobfuscate] Shrinking...
[wtkobfuscate] Removing unused program classes and class elements...
[wtkobfuscate] Original number of program classes: 1
[wtkobfuscate] Final number of program classes: 0
[b][wtkobfuscate] java.io.IOException: The output jar is empty. Did you
specify the proper '-keep' options?[/b]
^^^^^___Error that I get is here
[wtkobfuscate] at proguard.ProGuard.shrink(ProGuard.java:474)
[wtkobfuscate] at proguard.ProGuard.execute(ProGuard.java:86)
[wtkobfuscate] at proguard.ProGuard.main(ProGuard.java:916)

Here is my build.xml file:
[code]
<?xml version="1.0" encoding="UTF-8"?>
<project name="MIDP2.0" default="n66xx" basedir=".">
<description>
Build file for MyLittleProject
</description>
<!-- predefined antenna tasks -->
<taskdef resource="antenna.properties"/>
<!-- ProGuard home -->
<property name="wtk.proguard.home" value="C:\proguard3.2"/>
<!-- RetroGuard home -->
<property name="wtk.retroguard.home" value="C:\retroguard-v2.0.2"/>
<property name="midlet.name" value="MyLittleProject"/>
<property name="midlet.home" value="C:\Projects\J2ME\MyLittleProject"/>
<target name="build" description="Builds everything">
<antcall target="n66xx"/>
</target>
<target name="n66xx" description="Builds Nokia Models 6600 and 6620">
<ant dir="devices/nokia66xx" inheritall="true" target="build"/>
</target>
<target name="cellstory_init" description="Create directory structure">
<property name="src_pp" location="${preproc_dir}"/>
<!-- set global properties -->
<property name="src" location="src"/>
<property name="bin" location="bin"/>
<property name="res" location="res"/>
<property name="classes" location="classes"/>
<!-- Create the timestamp -->
<tstamp/>
<!-- Make directories -->
<mkdir dir="${src}"/>
<mkdir dir="${src_pp}"/>
<mkdir dir="${bin}"/>
<mkdir dir="${res}"/>
<mkdir dir="${classes}"/>
</target>
<target name="cellstory" depends="cellstory_init" description="Build it
all">
<wtkjad
jadfile="${bin}/${midlet.name}.jad"
jarfile="${midlet.name}.jar"
name="MyLittleProject"
vendor="Wizzards and Lizzards"
version="1.0.0">
<midlet
name="${midlet.name}"
icon="${midlet.name}.png"
class="${midlet.name}.class"/>
<attribute
name="deleteConfirm"
value="Do you really want to delete me?"/>
</wtkjad>
<!-- do preprocessing -->
<wtkpreprocess
srcdir="${src}"
destdir="${src_pp}"
symbols="${symbols}"/>
<!-- Compile the code -->
<wtkbuild
srcdir="${src_pp}"
destdir="${classes}"
deprecation="on"
target="1.4"
source="1.4"/>
<!-- Package the classes -->
<wtkpackage
jarfile="${bin}/${midlet.name}.jar"
jadfile="${bin}/${midlet.name}.jad"
obfuscate="false"
preverify="false">
<fileset dir="${classes}" includes="**/*.class"/>
<fileset dir="${res}" includes="**"/>
</wtkpackage>
<wtkobfuscate
jarfile="${bin}/${midlet.name}.jar"
jadfile="${bin}/${midlet.name}.jad"
tojarfile="${bin}/${midlet.name}._jar"
obfuscator="proguard">
</wtkobfuscate>
<wtkpreverify jarfile="${bin}/${midlet.name}.jar"/>
<!-- run -->
<wtkrun jadfile="${bin}/${midlet.name}.jad"
device="Series_60_MIDP_SDK_2_1"/>
</target>
<target name="cleanbuild" description="Cleans and builds">
<ant dir="devices/nokia66xx" inheritall="true" target="cleanbuild"/>
</target>
</project>
[/code]


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