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

The find command syntax is not correct, this way you get the message, this how you should use find command :

  find . -type f \( -iname \*.png \)  -exec convert "{}" -alpha off "{}" \;