Why do I get “License error: Mocha AE CS6 must only be launched from After Effects” when I try to open videos on my computer?

You may see this ifMocha AE has been accidentally set as the default program for that type of video file on your machine. Please use quicktime or windows media player as your default video player on your machine instead. If you need more detailed instructions to change your default OS video player, please read the following: For windows: http://windows.microsoft.com/en-us/windows/change-default-programs#1TC=windows-7 For mac: http://www.macworld.com/article/1154861/changedefaultapp.html