Why can't I add a featured product to cart in Effortless Theme?

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I have a featured product on my main page - Effortless Theme, and when trying to add to cart it shows an error message transcribed below.

Can someone help with coding??? Apparently there's nothing I can do through the theme settings...


Below is the message I get:

Parameter Missing or Invalid: Required parameter missing or invalid: items
Request ID: 66105d41-8d9b-4d83-8cf9-d632baeb1622"
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