After Effects keeps crashing today for some reason..says I am out of application memory....has happened 3 times in the last 20 mins and I haven't had this issue before. Any idea what could be causing this issue?

Screen Shot 2016-04-17 at 6.12.48 PM.jpg

I'm on an iMac
32 GB 1600 MHz DDR3
3.5 GHz Intel Core i7
NVIDIA GeForce GTX 780M 4096 MB