This failure can occur due to multiple reasons. Please ensure that you meet the below listed criteria and try again.
1. The image URL present in the CSV file should be publicly accessible and does not require any authentication.
2. The image URL should point directly to the image file and not to the web page where the image is uploaded.
3. There should be no restrictions to the site in which the image is hosted.
4. Try opening the image URL in a browser and check if the image is displayed. If the image is not displayed, then it cannot be used to import images using the plugin.
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