ERROR ITMS-90717: "Invalid App Store Icon."

I build an app and upload the .ipa file with Application Loader, and receive following error message.

description length:10052448

ERROR ITMS-90717: “Invalid App Store Icon. The App Store Icon in the asset catalog in ‘Exponent.app’ can’t be transparent nor contain an alpha channel.”

How do I solve this problem?

I found a solution.

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Thanks vincentwordtoday! It would be really nice if you add a link to the exact answer as there is a number of them by the link you provided.