Currently I have a Dell computer, 16 and 1 tera RAM memory, however I am trying to preview a video and the system gives me the following error: "The preview cache, needs 2 or more frames to reproduce" I have tried almost everything, but the video never plays me, always gets stuck and does not advance more than 1 frame and restart.
Sorry for my bad English, I'm new
Without any details about your comp, footage used, exact version of AE etc. nobody can tell you much.
It happens to me with all projects i have... I've download new After 2017 and it happens all time!!
For persistent causes of this issue, today's bug fix update should solve it.
See the Adobe blog post for more information: A June 2017 Update to After Effects CC Is Now Available | Creative Cloud blog by Adobe
Please let us know if it works for you!