Products with variants have not been entered correctly — Error during migration

Hey,

I’m getting “Products with variants have not been entered correctly” error while importing products to Shopify.
Those products are skipped, It suggests to View & Edit products. I’ve checked products several times, but there is no difference between in a way Variable products which was successfully exported and the ones having issue.
I’ve also noticed variable products having this issue aren’t in Stock. I’m assuming problem is “When variable product is not in stock” Plugin not working.

Please Help me solve that issue

Thanks