RAM preview needs 2 or more frames to playback.

[David Hamilton]

[Todd Kopriva]

https://blogs.adobe.com/aftereffects/2014/07/warning-ram-preview-needs-2-or-more-frames-after-scrubbing-audio-in-after-effects-cc-2014-13-0.html

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Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
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[David Hamilton]

Thanks – It’s not just limited to audio scrubbing. The same error happened today while I was moving the time indicator arrow across the work area to view my animation. Restarting AE temporarily fixed it.