After Effects Error Asked To Create Unknown Property Of Type Fix

⚠️ Always keep "Auto-Save" turned on in your Preferences to ensure you have earlier versions of your work to fall back on if a file becomes permanently corrupted.

Always use the expression pickwhip to create references. Typing them manually often leads to spelling mistakes.

This error usually happens when After Effects tries to load a , script, or preset that it doesn't recognize or that was created for a different version . It’s common when using older templates or third-party plugins like Red Giant Universe .

How to Fix the "After Effects error: asked to create unknown property of type" Bug

To fix the warning, you must resolve naming conflicts in custom pseudo-effects, update legacy expressions, or remove faulty ScriptUI panel scripts. This error usually occurs when Adobe After Effects tries to interpret outdated templates, complex Essential Graphics dropdowns, or custom extensions whose code names conflict with internal After Effects application core structures. What Causes the "Unknown Property" Error? ⚠️ Always keep "Auto-Save" turned on in your

Change the dropdown from JavaScript to Legacy ExtendScript .

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

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

You are opening an older project that uses expression methods no longer supported by modern Adobe After Effects versions. This error usually happens when After Effects tries

Check installed third‑party plugins

Does the error message list a specific in quotes (like ADBE... )? Share public link

This error message, is one of the most cryptic and frustrating crashes in After Effects. It essentially means the software tried to generate a parameter (like a position keyframe, a mask, or an effect controller) but the internal "blueprint" for that parameter was missing or corrupted.

The term FIX is internal jargon—it likely refers to a or an old, deprecated data type that newer versions of After Effects no longer support natively. You are essentially asking the software to build something using a blueprint it no longer understands. This error usually occurs when Adobe After Effects

: Older project templates may rely on legacy JavaScript syntax that native modern layout rules do not recognize.

Below is a to resolve the “asked to create unknown property of type FIX” error.

A corrupt or unsupported script loading automatically during startup will cause continuous crashes. Isolate the problematic script with this method: Close Adobe After Effects completely. Navigate to your application's script directory: