After Effects Error Asked To Create Unknown Property Of Type Fix

An expression references an effect (e.g., effect("Gaussian Blur") ) that was deleted or renamed.

Right-click the extension panel title and select Close Panel . Then, navigate to Window > Extensions > Motion 4 to reopen it. This forced reboot often clears the error immediately. 3. Update Legacy Expressions An expression references an effect (e

In your expressions, write robust code that checks for an effect's existence first: javascript This forced reboot often clears the error immediately

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. Deleting and re-creating that specific property (e

To fix the problem effectively, it's crucial to understand its root cause. Based on user reports and community discussions, this error usually stems from one of the following issues.