cannot be a variant with components

[akshuklait-92]

Hello Guys, 
I'm getting this strange error while placing an order on the Shopify store. After checking here & there, I found this error was coming because I was placing an order for a bundled item. 

Array
(
    [error] => Array
        (
            [line_items.variant_id] => Array
                (
                    [0] => cannot be a variant with components
                )

        )

)

is there any workaround to find out which item belongs to bundled items and with which API, I can place an order for an item that belongs to the bundle group? 
Any help would be highly appreciated.