podcast album art rejected
Can someone tell me why I am getting this error
"Podcast artwork must be between 1400 x 1400 and 3000 x 3000 pixels, JPG or PNG, in RGB color space, and hosted on a server that allows HTTP head requests."
My image is 1400 x 1400 (got specs off of Photoshop). Any help would be greatly appreciated.
http://gotteched.com/wp-content/uploads/2018/03/1400-by-1400-250kb.jpg