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Probably because that open and close is referring to Sigil just on opening an epub and on saving an epub. It looks more like you are trying to import a standalone html file that is not well formed. Just edit the file and remove that script open and close tag and replace it with an xhtml comment if you want the license info. Otherwise remove that script tag and its contents completely.
Another option is to open that html file in a text editor and copy and paste it into a blank xhtml document inside Sigil then run Mend on it.
Probably easier just to remove that bloody script tag and its contents, though.
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