Unable to import Classic Skins

The option to choose a classic skin and the button to import a classic skin from your device is there, but whenever I select a file that matches the criteria of a classic skin (64x64, 64x32, 128x128 png) the game reloads and a menu that says "Please select a .png with the dimensions 64x64, 64x32 or 128x128". I've loaded skins into the game on previous versions.