The easiest way is to let Sigil do it for you.
I would delete those 2 lines from the guide section.
Then go to the book browser, right click on your toc.xhtml file, choose Semantics, and check the Table of Contents.
Then right click on the Chapter 1.xhtml file, choose Semantics, and check Text.
Make sure that only one file has Text checked as its Semantics.
Now check your content.opf file and see how Sigil populated it. This will now convert correctly to mobi format
Bob
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