Other applications running in the background might interfere with After Effects, especially if they're using a lot of system resources or interacting with similar file types. Try closing other apps and see if that resolves the issue.
If the project crashes immediately upon opening due to this error, use the : Launch Adobe After Effects with a fresh, empty composition. Other applications running in the background might interfere
: Custom sliders or control panels embedded in downloaded templates that use obsolete naming conventions. : Custom sliders or control panels embedded in
Change the Expressions Engine from JavaScript to . 2. Isolate and Rename Pseudo-Effects Isolate and Rename Pseudo-Effects : Verify that all
: Verify that all required plugins for your project (e.g., Boris FX Continuum , Red Giant Universe , or Sapphire ) are correctly installed and updated. If a project was created on a machine with a plugin you don't have, After Effects may throw this error. Project Troubleshooting asked to create unknown property of type - Adobe Community
Corrupted local memory data often blocks the software from parsing standard properties.
You are opening an older project that uses expression methods no longer supported by modern Adobe After Effects versions.