I keep getting the error: " Store is empty "

Based on the above image shows an error, after running the update feed, which has a problem matching the SKUs in the store. This shows that Stock Sync failed to detect any products in the store.  

Reason 

• The SKU is not present in the store, which it affected the update feed for not detecting the same SKUs in the store. Thus, no products can be updated.

Solution

• Please add some products before running the updated product feed. 
  
  
• Check the SKU in the store by comparing the SKUs in the feed file.