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

If updating the expressions fails, forcing the software to compile code via the older engine can bypass strict data-type parsing errors. Navigate to . Click on the Expressions tab.

Understanding why this error happens is key to preventing it in future projects:

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is often triggered by or third-party scripts that attempt to initialize a user interface or background function using outdated or incorrect property identifiers.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 If updating the expressions fails, forcing the software

If the error message includes a specific property name (e.g., "unknown property of type 'Mask Feather'"), use that clue to inspect your project for that specific property. Deleting and re-creating that specific property (e.g., removing a mask and drawing a new one) often resolves the issue immediately.

Ensure that any third-party plugins or effect presets you're using are compatible with your version of After Effects. Understanding why this error happens is key to

For project-open errors, try creating a new file and importing the problematic one.

You have an expression (the little pick-whip code) linking one property to another. Sometimes, if the source property is deleted or renamed, the expression tries to "create" a link to a property that no longer exists, confusing AE. Deleting and re-creating that specific property (e

This is often the most effective solution, especially for launch errors.

After Effects will attempt to safely import your comps as a clean folder branch, bypassing the initialization error. 5. Clear Corrupted Cache and Presets