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

Try moving scripts out of this folder one by one to identify the "troublemaker". Change the Expression Engine:

Install the required third-party software (e.g., Trapcode, Element 3D, or Sapphire). Try moving scripts out of this folder one

: 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: If you'd like to try a specific fix,

If a specific project file won't open, importing it into a fresh project can bypass corrupted startup metadata. Primary Fix: Isolate and Remove Problematic Scripts

This specific error is often triggered by or third-party scripts that attempt to initialize a user interface or background function using outdated or incorrect property identifiers. Because After Effects cannot identify what "type" of property the script is asking for, it halts the process. Primary Fix: Isolate and Remove Problematic Scripts