Refer to the official documentation by Apple regarding generating theicnsiconhere

You need to have matched the requirements or the Application Loader will fail.

• icon_16x16.png
• [email protected]
• icon_32x32.png
• [email protected]
• icon_128x128.png
• [email protected]
• icon_256x256.png
• [email protected]
• icon_512x512.png
• [email protected]

1. Create an iconset$ mkdir [name].iconset
2. Add all the PNG's to the iconset folder
3. Run the icon util$ iconutil -c icns <iconset filename>
4. Replace theapp.icnsand thedocument.icnsfile with the generated icns insideyour.app/Contents/Resources