User blog comment:Hellexarus/Sprite Ideas for Mods/@comment-4674838-20120326172002/@comment-4674838-20120326182735

Without a screenshot, I have nothing to go off of. I'm not sure about that error, it's probably something on your end. Try doing one upload using Special:Upload -- if it works, let me know. If it doesn't, try uploading your image to http://tinypic.com/ and then copy/paste the direct link URL onto your blog post (hotlinking) to display the image.