After Effects Error Asked To Create Unknown Property Of Type Fix May 2026

This error usually happens when After Effects tries to load a project, preset, or script that references a "Pseudo Effect" or a specific property type that isn't installed on your system . 🛠️ Core Fixes

macOS: /Applications/Adobe After Effects (version)/Scripts/ScriptUI Panels This error usually happens when After Effects tries

Safe-Mode Opening: A dedicated "Safe Open" that strips all non-native effects to allow project recovery without crashing. If you'd like to try a specific fix, let me know: Step-by-Step Fixes 1

Missing Plugins: Opening a project that uses effects you don't have installed can trigger "Unexpected data type" or property creation errors. Step-by-Step Fixes 1. Identify and Remove Problematic Scripts Change Expression Engine File > Project Settings >

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)