GMPublish "Couldn't load icon - is it a jpeg?"

So, I’m trying to upload my server content. I made a 512x512 jpg image and made my .gma addon, I went publish my addon and I got this error:

As you can see, I tried it many times. I tried changing the size of my image as it was 220kb, so I changed the quality and now its only 33.8kb. Not sure what I’m doing wrong, hopefully someone can help me. Thanks.

Could you post the icon here?

Resave the icon with Paint or Paint.NET.

That worked, thanks!