It seems to be working now, idk how/why whas not working… Enjoy! 🙂
I think it’s the same error as mine, just stopped working today/last days:
https://wordpress.org/support/topic/error-file-attachment-metadata-error-2/
Same here (or I don’t know how to use this tool)…
WP 4.1.1 + XML Sitemap Generator for WordPress 4.0.8
