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

Before diving into the detailed fixes, use this guide to identify the most likely cause of your error:

Let the automated script run to update the older expressions to the modern JavaScript engine. 3. Clear User Presets and Third-Party Scripts

A third-party script is trying to generate a parameter or keyframe that is invalid for that specific type of layer.

If the error involves expressions, Adobe provides a built-in tool: Before diving into the detailed fixes, use this

Corrupted application memory data blocks will persistently call up non-existent property configurations.

Adobe includes a built-in utility script designed to scan your project timeline and patch old syntax patterns automatically. Open your problematic project file. Navigate to the top menu bar. Click on .

If the loop is preventing you from clicking anything or even opening your .aep timeline, you can bypass the corrupted initialization sequence by pulling your assets into an independent project space. If the error involves expressions, Adobe provides a

Think of it as a translator error: A script is trying to tell After Effects to "Set the color of the 'magic-layer-101'," but if that layer doesn't exist, or the "color" property isn't applicable to that layer, After Effects returns this error. Common Causes for the "Unknown Property of Type" Error

Select the problematic .aep file and import it directly into your new project container.

: Corrupted background settings can prevent AE from loading properties correctly. : Reset preferences by holding Ctrl+Alt+Shift (Windows) or Cmd+Opt+Shift (Mac) while launching After Effects. Extension Boot Issues Navigate to the top menu bar

to bring your old project into it. This can sometimes bypass project-level corruption. Change Expression Engine File > Project Settings > Expressions , try switching the "Expressions Engine" to Legacy ExtendScript Error: asked to created unknown property of type "x" (1d16)

If the error occurs while animating, it’s usually an expression. Scenario A: Missing Effect/Layer