Recently, I've got automatic response after archive my App into the testflight as above.
Dear Developer,
We identified one or more issues with a recent delivery for your app.
Please correct the following issues, then upload again.
ITMS-90338: Non-public API usage - The app references non-public selectors in Runner: initWithParentViewController:. If method names in your source code match the private Apple APIs listed above, altering your method names will help prevent this app from being flagged in future submissions. In addition, note that one or more of the above APIs may be located in a static library that was included with your app. If so, they must be removed. For further information, visit the Technical Support Information at http://developer.apple.com/support/technical/
Best regards,
The App Store Team
Problem is that I can't find the way to identify Non-public API usage on my code. I've build my app with Flutter, not swift. And there were no problem previous build, ver 2.0.15.
Please let me know how to figure out Non-public API and solve this.
Best Regards