After Effects Error Asked To Create Unknown Property Of Type Fix [ REAL × 2025 ]

Go to File > Project Settings . Under the Expressions tab, change the Expression Engine from "JavaScript" to " Legacy ExtendScript ". 6. Reset Character and Preferences

Check the "Effects" panel for any entries labeled "Missing." Go to File > Project Settings

The "After Effects error: asked to create unknown property of type" is a common but frustrating warning that typically indicates a mismatch between the software and the project's scripts, expressions, or plugins. This error often occurs when After Effects encounters a "pseudo-effect" or a custom property it doesn't recognize Common Causes Outdated Expressions Go to File > Project Settings