Hi, If anyone still getting this error, I fixed mine by following these two steps.
Step 1 – Check where the product is stocked at; by going to the product page, then select the product you are having trouble with, then click the ‘edit products’ at the bottom. Then click ‘columns’ at the top of the page and tick ‘stocked at’ and then see whats the value in that column (eg: cjdropshipping, Aliexpress etc).
Step 2 – Go to settings and then click ‘Shipping and delivery’. Go into general shipping rates and click manage. Under the tab ‘shipping from’ click ‘show details’ and you will see the same address that is displayed in the ‘Stocked at’ column on the product page. Create shipping rates for that particular warehouse by clicking manage and then filling out the rest.
And this should solve the issue. Hope this helps…