S2W–no imgae can be downloaded

Hello, I ‘am using S2W – Import Shopify to WooCommerce, at the first time it is okay to downlode the images, then for some reasons, I deleted all the products and want to start over again, but this time the Product images are always being downloaded in the background, no imgae can be downloaded at all,How to solve the problems? Thank you very much.
Best regards
Jim