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Your lulu specific errors i can't help you with you will have to ask lulu about them.
In your original post you said you had three errors. At that point take your epub file put it in calibre and use the twek calibre feature to:
1) edit the opf file, removing whatever file-as attribute it is complaining about
2) edit the two html files to remove the lang attributes
do not run anything else on the epub at this point.
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