Hi Bhakti,
It isn't very clear to me, but as far as I understand, your flow (behind the button) is either expecting an object or a list. You need to make a choice there and adjust the logic.
Especially on your last dialogic, it says: Árgument for paramter "dataview’ (which means it expects only 1 object, and not a list. Your argument is alist. That wont work. So you can put a listview on the page, where the flow is navigating to, or give an single object as parameter.
Good luck,
Mark