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Moved from the Creative Cloud to the After Effects forum. They will be able to help you here.
Need to know a little more about your project. When do you get the error message? What are your render settings? How are you trying to render? Rencer Cue? AME? What OS? Is AE up to date?
As Rick says, we need to know a lot more if we're going to help you. Please provide answers to the questions listed here: "FAQ: What information should I provide when asking a question on this forum?"
That's a Quicktime error, but as the otehrs already said, we need a lot, lot more info about render settings, comp settings, where you store the file, exact version of OSX and so on.