ITunes Producer: submission error message

Yesterday I made my first attempt to submit my book to iBooks and got the following error message:
"@env: parameter is null: (null)"
I have no idea what this error refers to, nor does iTunes Producer give you any clues what it is nor how to correct it. I'm left in the dark to know what to do next.
Has anyone come across this error before and successfully corrected it? Any help would be appreciated.

I had the same problem and somehow solved it.
I guess you just published from iBooks Author and it launched the NEW iTunes Producer that had been seamlessly updated by the App Store mechanism.
The issue appears related to the new Producer not authenticating properly, maybe because it inherits data from the previous version but something does not translate completely.
Try this:
- quit Producer
- launch it again DIRECTLY (find the icon and click it)
- you should see the login form, fill it and ensure everything is fine
- go to your project folder and remove the old *.itmsp file that was generated but left pending
- retry publishing from within iBooks Author
HTH,
Mario

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