I'm trying to create a shortcode to use for Wordpress "shortcode" widget. But when I try to save the page, this error pops up everytime: Updating failed. The response is not a valid JSON response.
Moreover, after saving, the dropdown jumps to the top of the page, and at the section where I placed the shortcode, value 1 is showing.
Here's my code inside function.php
return include ("KB/widget/shipping-calculator.php");
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