Why does adding to cart on my new theme show a missing parameter error?

[Footfuel]

Hi , Recently bought a theme for my shopify store when i was working with the theme the theme provider from which i bought the theme vanished and I am Having so much problem with this theme My recent problem is when i try to add to cart from the product page it shows error missing parameter can anyone help me with this problem ?

[thelbvapestore]

 Hello,

While you adding a new product make sure in the shipping section it’s checked check the below and advice if your issue solved

[Footfuel]

Already that button is checked you can check the problem on my website
footfuel.in go to a hairband product page and try adding it to the cart