Uploading Apps to the Android Market Invalid Icon Image Size

I'm trying to upload my first application, but when I select the apk file, I get the following message:

The icon for you开发者_如何学Pythonr application is not valid. Please use a 48x48 PNG.

The file was created in Fireworks, and is a 48x48 24 bit image named appicon.png.

Anyone know of any reason why I would still get this message?

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Never Mind, I found the problem. It was a bad value in my manifest file.