The answer came to me after trying to confirm my application after unsuccessfully sending it to MacAppStore. I thought that by confirming this, I should get a more detailed error message, instead of this "Packing operation error". And here it is:
And this is because I had to revoke my certificates (as for why I had to cancel them, don’t ask, I don’t know, this happens in every 2 materials ...). And I recreated only the Mac Submission certificate. In fact, you also need Installer. It's late, I thought I really needed this? ... Therefore, I finally did a half-time little dance in Keychain.app -> Request a certificate from a certification authority ... etc., upload to itunesconnect and download them back. After that he worked.
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