Try uninstalling and reinstalling After Effects.
Did you follow Szalam's advice and uninstall/reinstall? Please let us know what happened?
One of my students is having the same problem, We uninstalled and reinstalled many times but AE just won't launch.
MacBook Pro (Retina, 13-inch, Mid 2014)
Processor 2.6 GHz Intel Core i5
Memory 8 GB 1600MHz DDR3
Startup Disk Macintosh HD
Graphics Intel Iris 1536 MD
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Have you tried setting it to run as Admin?
Did you solve this issue yet?