Mac App Store Upload Fail: Validation Error (SFML)
I fixed it! 
The problem was that I had only edited my project-info.plist. I went and added the same lines for CFBundleSupportedPlatforms to the info.plist's for each of my external frameworks.


CFBundleSupportedPlatforms => array,
item0 => MacOSX


Seems to have done the trick.