After Effects Error Asked To Create Unknown Property Of Type -

Use PropertyGroup.addProperty() with a known match name or display name, or create via PropertyGroup.property("ADBE...") . 4. Expression trying to create properties dynamically Expressions cannot create new properties permanently. If you're trying to write a custom value into a non‑existent property, AE will throw this error.

"ADBE Mask" , "ADBE Effect" , "ADBE Paint" , etc. Wrong: passing a custom string that AE doesn't recognize. after effects error asked to create unknown property of type

Pre‑create the property via a script, or store custom data using text.sourceText on a hidden text layer or marker.comment . 5. Script expecting a specific AE version property Some properties (e.g., 3D Gizmo, Cinema 4D renderer options) exist only in newer versions. Use PropertyGroup