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Check your footage. This could indicate a damaged source file or leaky CoDec.
And, if what Mylenium suggested doesn't help, what are your memory and multiprocessing settings?
Also, what, exact, version number of AE are you using?
At first my source footage was AVI with alpha, after Mylenium's tip I changed it to MOV with alpha and since then I got this error only once so far (actually the error was "unable to allocate 0,000 MB of memory", and the project at that time contained around six 3D layers of the same MOV footage).
I have allocated 5GB for After Effects in preferences and the version number is 220.127.116.118
the version number is 18.104.22.1688
the after effects version you are using is the not up to date. you should update it to 11.0.4. many bug fixes, maybe even the issue you are facing.
whatever release you are using - ALWAYS use the most updated version of each release.