Meaning of Animation Warning

I've made a simple camera animation that does exactly what I want, but I get this warning in the console: "Animation clip is not retargetable, Animation Clips used within the Animation Controller need to have muscle definition set up in the Asset Importer Inspector" Everything works the way I want it, but last time I got an error using animations my project couldn't open, so I'm trying to be cautious. Is this something I have to worry about, or can I just ignore it?