After Effects Error Asked To Create Unknown Property Of Type -

Navigate to your local Adobe system script folder: Program Files\Adobe\Adobe After Effects [Version]\Support Files\Scripts\ScriptUI Panels Move third-party scripts temporarily out of this folder.

If your error says something like "property of type: PseudoEffectU" or similar technical jargon, it is almost certainly a Pseudo-Effect used by a script or rigging tool (like character rigging tools). You likely need to re-install the script that generated that pseudo-effect. after effects error asked to create unknown property of type

If you provide the that triggers the error, I can give a targeted fix. Navigate to your local Adobe system script folder:

Before fixing it, it helps to understand why it happens. The error technically means that After Effects received a request to generate a property (like a slider, a point control, or a color) that it does not recognize or cannot find the definition for. If you provide the that triggers the error,

Some properties (e.g., 3D Gizmo, Cinema 4D renderer options) exist only in newer versions.

Below is a detailed guide on what causes this error and how to fix it.

if (layer.hasOwnProperty("sourceRectAtTime")) // safe to use