Error including icons in package

Question

I am attempting to include icons in my Air application. Unfortunately, during the package phase, I am receiving the following errors:
/Users/gene/Development/Projects/Flex/app/My-app.xml(18): error 303: Icon Source/assets/icons/icon16.png is missing from package
/Users/gene/Development/Projects/Flex/app/My-app.xml(19): error 303: Icon Source/assets/icons/icon32.png is missing from package
/Users/gene/Development/Projects/Flex/app/My-app.xml(20): error 303: Icon Source/assets/icons/icon48.png is missing from package
/Users/gene/Development/Projects/Flex/app/My-app.xml(21): error 303: Icon Source/assets/icons/icon128.png is missing from package
I've found multiple threads dealing with this issue, but they all say to do what I am already doing. I am posting my -app.xml file and the command I am using in hopes that someone can see what I am missing. Thanks.
-app.xml:
<?xml version="1.0" encoding="UTF-8"?>
<application xmlns="http://ns.adobe.com/air/application/1.5">
    <id>com.baruconsulting.Myapp</id>
    <version>1.0.8</version>
    <filename>Myapp</filename>
    <programMenuFolder>Baru</programMenuFolder>
    <initialWindow>
        <content>Myapp.swf</content>
        <visible>true</visible>
        <systemChrome>none</systemChrome>
        <transparent>false</transparent>
        <width>1000</width>
        <height>750</height>
        <x>50</x>
        <y>50</y>
    </initialWindow>
<icon>
<image16x16>Source/assets/icons/icon16.png</image16x16>
<image32x32>Source/assets/icons/icon32.png</image32x32>
<image48x48>Source/assets/icons/icon48.png</image48x48>
<image128x128>Source/assets/icons/icon128.png</image128x128>
</icon>
</application>
package command:
adt -package -storetype pkcs12 -keystore temp.pfx Myapp.air My-app.xml Myapp.swf
Thanks,
Gene

Answer 1

For more info,
http://help.adobe.com/en_US/AIR/1.5/devappshtml/WS5b3ccc516d4fbf351e63e3d118666ade46-7fd6. html
GoTo Error code : 303.