When you run After Effects, you could receive messages like, "Unable to allocate 0.000 MB of memory" or, "Unable to allocate 0.002 MB of memory."
It can be a project-specific issue or a system configuration issue.
Purge Memory and Disk Cache:
- Select Edit > Purge > All Memory & Disk Cache.
- To delete all the files from your disk cache, click OK.
Another way to clean Media and Disk cache is:
- Select After Effects CC > Preferences > Media & Disk Cache.
- In the Preferences dialog, click Empty Disk Cache to clean disk cache and Clean Database and Cache to clean media cache.