After Effects Error Asked To Create Unknown Property Of Type Fix 2021 < 2025-2026 >

: Temporarily move scripts out of your ScriptUI Panels folder to see if the error persists. You can find this folder in the Adobe After Effects installation directory under Support Files/Scripts/ScriptUI Panels . Rename Conflicting Pseudo-Properties

: If the error is expression-related, try switching engines. Go to File > Project Settings > Expressions and change the engine to Legacy ExtendScript .

Instead of one massive expression, break complex expressions into smaller chunks. : Temporarily move scripts out of your ScriptUI

If you encounter this issue right after installing a new utility, a bad script or plug-in is likely confusing the internal software schema.

If this error appears immediately after running a script (like a motion graphics toolkit or a rigging tool): Go to File > Project Settings > Expressions

This error typically brings your workflow to a screeching halt, preventing you from saving, rendering, or even closing the application without a force quit. Unlike a simple syntax error, the "fix" property error points to deeper corruption, plugin conflicts, or project file damage.

If the error popped up but the project is still responsive, . Saving in a corrupted state may permanently damage the AEP file. If this error appears immediately after running a

Rename pseudo-element items to avoid naming conflicts with AE defaults. asked to create unknown property of type - Adobe Community

Find the expression, kill the weird code, or re-build the master property. You'll be back to keyframing in less than five minutes.