After Effects Error Asked To Create Unknown Property Of Type Fix [portable] Jun 2026

After Effects Error: "Asked to Create Unknown Property of Type" - Causes and Fixes

Go to File > Project Settings . Under the Expressions tab, change the Expression Engine from "JavaScript" to " Legacy ExtendScript ". 6. Reset Character and Preferences After Effects Error: "Asked to Create Unknown Property

If found, you must install the plugin or delete the effect causing the error. 4. Remove the Problematic Expression After Effects Error: "Asked to Create Unknown Property