Since Woo Category Slider is a product category image slider. So, inorder to make the plugin to work you must set the category image first. To set the image of any category login to the site using your admin username/password. After login from the left panel Select Products >> Categories
Woo Category Slider documentation

From the proceeding screen put all the category details finally click on the “Upload/Add Image” button. Select or upload the category image and hit save.
Woo Category Slider documentationWoo Category Slider documentation

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