I'm getting this error every time I am using AE. I can preview fine at the start of a session (just after loading AE) but then the previews get shorter and shorter until it can't even render 2 frames. The only thing that fixes it is restarting AE, which I have to do every 20 minutes. Surely AE shouldn't be running out of preview space over time?
I have no audio in the project. Purging all memory makes no difference.
Im getting this issue also. Also not able to render out a Pro Res sequence.
Project is an animated Element 3D logo.
2013 15" Macbook Pro
2GB Nvidia 750M
Some things to try. Make sure that 'RAM reserved for other applications' is set to it's minimum value (for me this is 1.5 GB - anything else makes the problem worse). Also try checking the box 'Reduce cache size when system is low on memory'.
edit: Still doesn't fix the problem. Adobe support says I need more RAM (I have only 4GB, which is the minimum required for AE).