I can't able to create variation for my product, I have created single listing and it's active-> when I click edit products, -> create listing for this product -> pop up box arrived NOTE : I need only size variation -> clicking size checkbox and click continue not works, but it works after creating 3 checkboxes of size, color, & number of items. Also tries using FLATFILE upload still error code on color field is required BH. My product catagory is innerwear pack of 3