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Chapter 3 Reload After Submitting The Form, Error

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On page 60 of chapter 3, after I submit the form and get the proper result, I reload the handle_form.php page and I get some errors on line15, 16, 17, 18 of the code displaying undifined index. why is that? 
I notice the same thing happens when I just start the handle_form page without filling the feedback.html first. why is that? why don't I just get a blank page if I didn't fill the feedback.html first? and after filling the form and submitting it, why do I get a different result with error after reloading the handle_form.php page for the second time?

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