If you're getting this error: "Error: base: Image uploading failed", it's because the featured image for your blog post is broken.
How to Resolve The Image Uploading Failed Error
- Click on Page Settings on the left-hand side of the editor.
- Scroll down to the Featured Image option and click "remove" to clear out the broken image.
- Upload the image again, or an entirely new image, or leave it blank.
- Save and republish.