After Effects Error Asked To Create Unknown Property Of Type Fix Access

If you are the one creating the preset, ensure that the names in your pseudo-effect do not conflict with After Effects' internal naming structure (e.g., avoid using general terms like "Layer" as a custom property name).

If the error is locked to a specific project file:

: /Applications/Adobe After Effects (Version)/Scripts/ScriptUI Panels

: 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 you are the one creating the preset,

Verify which elements are used in the layout. Install the required plug-in or preset to force After Effects to recognize the property. 4. Create a Clean Project Import

To avoid seeing "Asked to create unknown property of type" again:

Change the dropdown from JavaScript to Legacy ExtendScript . Create a Clean Project Import To avoid seeing

Open your project file and navigate to . Click on the Expressions tab.

Turn off layer visibility one by one to see when the error stops. Remove custom scripts from the ScriptUI Panels

Applying a preset that relies on a "pseudo-effect" (custom-coded controls) that hasn't been properly initialised or created in your version of After Effects. Legacy Expressions: It is almost always caused by:

: C:\Program Files\Adobe\Adobe After Effects (Version)\Support Files\Scripts\ScriptUI Panels

This error is almost never caused by a bug in After Effects itself. It is almost always caused by: