Impossible Add-on validation

please, can someone help me? I have finished an add-on using jpm; it has two @xxx.xpi files; I used jpm sign, but it has given error 401, so the authentication failed; then I have tested it at https://addons.mozilla.org/en-US/developers/addon/submit/2
but I have obtained this:

I cannot understand this tipology of error; it is indicated the other .xpi file is to be checked first. I tested it, and that’s the result:

but strangely, clicking the “See full validation report”, I see “Add on passed validation”, no error detected.

What have I to do to test it with success?

The first error is about your XPI file containing another XPI file. In most cases this not what you want, except if you bundle several different add-ons in one add-on.

The second error is about the add-on ID already being in use. This means you’re either not logged in with the correct account or you need to change the add-on ID to something else.

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Thanks