out of stock error for variable products

I used this way but did not work too , when i upload a csv with stock , it appears out of stock again and again.
1) Make sure your WooCommerce plugin version matches WC database version in your System Status report (WooCommerce > Status). If it’s not, please run Update database tool from WooCommerce > Status > Tools.

2) Run Product Lookup Tables from WooCommerce > Status > Tools. Make sure that corresponding tasks appeared in WooCommerce > Status > Scheduled Actions

3) Sometimes, even after running both tools above, products still appear out of stock. Then to fix it, you can try saving the product again without making any changes or export them it to CSV and import back.

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