After Effects Error Asked To Create Unknown Property Of Type Fix • Authentic & Best

: This often happens when you try to apply a preset that requires a specific third-party plugin you haven't installed (e.g., Red Giant Universe or Boris FX).

: Corrupt temporary files can sometimes lead to "unknown" property errors. Use Edit > Purge > All Memory & Disk Cache to clear the system.

Check installed third‑party plugins

Move all items out of this folder to a temporary desktop directory. Re-introduce them one by one, restarting After Effects between each until the crash or loop triggers again. 2. Update or Change the Expressions Engine

If the project structure itself is corrupted and prevents you from even viewing your workspace, you can often bypass the broken property reference via importing: : This often happens when you try to

If updating legacy expressions didn't work, try changing the engine your project uses to evaluate them.

Open a new, empty After Effects project. Go to File > Import > File and select your corrupted project. This often allows you to recover your compositions without triggering the property error. 5. Switch Expression Engines Check installed third‑party plugins Move all items out

if (effect("Gaussian Blur")("Blurriness").numKeys > 0) // do something else value; // Default to current value Use code with caution. Conclusion

If the error message includes a specific keyword after "type" (e.g., "type Pseudo/Effect Name"), it points directly to a plugin. Update or Change the Expressions Engine If the

folder (found in the AE installation directory) and add them back one at a time to find the "troublemaker". Clear User Presets: Navigate to ~/Documents/Adobe/After Effects [Version]/User Presets