ionic3 - Invalid App Store Icon. The App Store Icon in the asset catalog in 'YourApp.app' can't be transparent nor contain an alpha channel

Question

My ionic3 project build IOS successed, but when I upload it to itunes connect error showing

then I try follow this ANSWER, but showing this for me find: c

Answer 1

If you don't have Photoshop, you can also try it in the free Paint.Net:

• Load the file and save it again but select 24 bits in the options.
• You will see in the preview that the image will be rendered against a white background.

Thanks Midora from https://forums.getpaint.net/topic/30381-removing-the-alpha-channel/