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

/Applications/Adobe After Effects (version)/Scripts/ScriptUI Panels .

Delete or temporarily relocate all contents within this directory, then reboot your workstation. 3. Clear Preferences and Use Safe Mode

1. The Clean Project Import Method (Best for Unopenable Files) Clear Preferences and Use Safe Mode 1

: Choose Edit > Purge > All Memory & Disk Cache to remove lingering temporary background errors.

Open a new, empty After Effects project. Go to File > Import > File and select your corrupted project. This often allows you to recover your compositions without triggering the property error. 5. Switch Expression Engines Go to File > Import > File and select your corrupted project

: Faulty or outdated scripts in your ScriptUI Panels folder can trigger this error on startup.

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 . empty After Effects project.

Click "Yes" when asked if you want to delete the preferences file. Step 5: The "New Project" Import Trick

Example Fix: Change text.animator("Animator 1").property("Position") to a more direct reference if the animator was renamed. 6. Clean the Media Cache Sometimes the error is simply cached wrong. Go to . Proactive Tips to Avoid This Error

Ensure your strings strictly utilize updated documentation rules. For instance, creating a shape repeater requires a valid match name mapping under the shape group contents. Double-check capitalization and hyphens against an up-to-date Adobe ExtendScript dictionary. Quick Reference: Troubleshooting Summary Primary Cause Immediate Solution Loading older .aep templates Outdated coding strings Run Appears immediately on startup Broken ScriptUI layout file Clear out the ScriptUI Panels directory Project won't open at all Structural composition lock Import file into a blank project Using specific third-party presets Missing layout sliders/effects Update or reinstall the target Plug-in

When the error triggers right at system startup before a project is even loaded, a corrupted plugin or background script is responsible. Close After Effects entirely. Navigate to your system's script folder directory: