Application Loader - Icon-Small-50.png doesnt meet the size requirements 72x72

I have published the app and downloaded the .ipa file. When I go to send it to apple via the Application Loader, I get an error message:

"iPad: Icon-Small-50.png: icon dimensions (50x50) don't meet the size requirements. The icon file must be 72x72 pixels, in .png format"

The issue I am having is that not all of the icon previews are showing up under the settings screen before I publish. I checked, and my files are all set to the proper dimensions.