Failed to start on macOS Big Sur (x86_64, Intel)

[koddr]

Hi,

I did exactly what the README says, but I get this error when I run it on the macOS Big Sur 11.6.2 (20G314), x86_64, Intel:

MyApp.app cannot be opened because of a problem.

Check with the developer to make sure MyApp.app works with this version of macOS. 
You may need to reinstall the application. Be sure to install any available updates 
for the application and macOS.

Click Report to see more detailed information and send a report to Apple.

What did I do wrong? What's the problem?