After Effects Error Asked To Create Unknown Property Of Type Fix |link| -

: Creating a custom control with a reserved name (such as naming a property control "Layer") confuses After Effects.

Change parameter names to unique identifiers (e.g., use , "Menu Type" , or "Choose Color" instead) to eliminate the core conflict. 3. Clear Out the User Presets and Cache Folders

A very specific and common cause of this error involves a concept called "." : Creating a custom control with a reserved

Open the Error Console (if prompted) or check recent changes to your layer structure.

If the error acts as a gatekeeper blocking you from opening your .aep file altogether, you can bypass the corrupt metadata by pulling the data into a fresh container: Launch a brand-new, empty After Effects project file. Go to . Choose your corrupted .aep project file and click import. Clear Out the User Presets and Cache Folders

The error frequently appears in a few contexts:

: Projects created in older versions of Adobe software that rely on deprecated JavaScript formats. Choose your corrupted

If you are using the After Effects Beta and seeing this error, this is a highly specific and effective fix.