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You can break the document up by chapter using InDesign. You don't need Sigil to do it. Use the "Break Document at Paragraph Style check box on the Contents tab of the EPUB Export dialog box. Select the paragraph style you are using for your chapter headings.
As to the second error, did you name your cover (or some other file) with an apostrophe? If so, rename the file without the apostrophe.
That should do it.
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